Electrode boiler energy storage device
By using the combination of atmospheric heat storage tank and electrode steam boiler in high-temperature heat storage technology, the problems of medium leakage, low life and high cost in traditional high-temperature heat storage technology are solved, and efficient and low-cost energy storage and power generation effects are achieved.
Patent Information
- Application Number
- CN202421158024.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-05-24
AI Technical Summary
In the existing high-temperature heat storage technology, there are problems such as medium leakage, low cycle life, high cost and low safety, making it difficult to achieve efficient and low-cost energy storage and power generation.
The combination of an atmospheric heat storage tank and an electrode steam boiler is adopted to replace the traditional high-temperature heat storage method. The water in the atmospheric heat storage tank is quickly heated by the electrode steam boiler to achieve efficient energy storage and heat release.
It achieves a high-temperature heat storage effect with a simple structure, fast starting speed and low cost. The electric heat conversion efficiency is as high as 99%. The total heat storage is the same as that of traditional high-temperature heat storage, but the total investment is lower, and the equipment life and safety are much better than the traditional method.
Smart Images
Figure CN222864903U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of high-temperature heat storage, and in particular relates to an electrode boiler energy storage device. Background Art
[0002] In general, compressed air energy storage needs to effectively utilize the heat energy released when compressed air in order to improve the energy storage efficiency. However, the storage efficiency of this part of heat energy is either low or the storage cost is high, making it difficult to achieve industrial production. Currently, there are three common storage methods: one is pressurized water thermal storage tanks: they need to be made into spherical storage tanks, but there are not many manufacturers in China that can manufacture them, and the cost is extremely high; the second is high-temperature thermal oil: it has the disadvantage of a short cycle life and high maintenance costs; the third is molten salt heat storage: it is easy to leak, and the production and maintenance costs are high.
[0003] Patent CN220378353U provides a dual-cycle ORC power generation system for recovering waste heat from a liquefied compressed air energy storage system, including a connected high-pressure section waste heat power generation unit, a low-pressure section waste heat power generation unit and a condenser, wherein the high-pressure section waste heat power generation unit includes a high-pressure evaporator and a high-pressure preheater connected via a high-pressure working fluid pipeline, and the low-pressure section waste heat power generation unit includes a low-pressure evaporator and a low-pressure preheater connected via a low-pressure working fluid pipeline; the high-temperature heat transfer oil outlet and the low-temperature heat transfer oil inlet of the liquefied compressed air energy storage system are respectively connected to the high-pressure evaporator and the high-pressure preheater, the high-pressure evaporator is connected to the low-pressure evaporator and the high-pressure preheater, the low-pressure evaporator is connected to the low-pressure preheater, and the low-pressure preheater is connected to the low-pressure heat transfer oil inlet.
[0004] General high-temperature heat storage uses thermal oil, phase change materials or molten salt heat storage. Although the temperature is high, there are problems such as medium leakage, low cycle life, high cost and low safety. Utility Model Content
[0005] In order to effectively solve the problems existing in the prior art, the utility model provides an electrode boiler energy storage device, which adopts a combination of a normal pressure heat storage tank and an electrode steam boiler to replace the above three heat storage methods, has a simple structure, fast startup speed and low cost.
[0006] The utility model adopts the following technical solutions to solve the above problems:
[0007] An electrode boiler energy storage device comprises an electrode steam boiler and a normal pressure heat storage tank, wherein the normal pressure heat storage tank is connected to a heat exchanger, a water outlet of the normal pressure heat storage tank is connected to a water inlet of the electrode steam boiler, and the electrode steam boiler is also connected to a steam user.
[0008] Furthermore, the steam user is a high-temperature steam user, and the electrode steam boiler is connected to the high-temperature steam user through a superheater.
[0009] Furthermore, the atmospheric pressure heat storage tank is connected to a condensation return water device, and the condensation return water device is used to recover condensation return water formed by undischarged steam.
[0010] Furthermore, the heat exchanger is a steam-water heat exchanger, and the heat exchanger is connected to the steam outlet of the electrode steam boiler.
[0011] Furthermore, the heat exchanger is a heat storage heat exchanger, and the heat exchanger is connected to an electric motor via an air compressor.
[0012] Furthermore, the heat exchanger is connected to a salt cavern for storing compressed air, and the salt cavern is also connected to a heat recovery heat exchanger for heating the compressed air.
[0013] Furthermore, the heat recovery heat exchanger is connected to a turbine for reducing the pressure of compressed air, and the turbine is connected to the steam outlet of the electrode steam boiler.
[0014] Furthermore, the turbine is also connected to a generator, and the generator is respectively connected to the electrode steam boiler and the electric motor to provide electricity therefor.
[0015] The beneficial effects of the utility model are:
[0016] 1. The utility model adopts a combination of a normal pressure heat storage tank and an electrode steam boiler to replace the three heat storage methods in the prior art. The advantages are that the normal pressure heat storage tank and the electrode steam boiler are both common technologies, and the cost is not high, the structure is simple, and the startup speed is fast;
[0017] 2. The electrode steam boiler is powered by electricity and has a fast startup speed. It can quickly raise the water temperature in the atmospheric pressure thermal storage tank from 90°C to 200°C or even 300°C within a few minutes, and its electric heat conversion efficiency is as high as 99%. This can further improve the efficiency of the entire energy storage system;
[0018] 3. This device is an energy storage power generation system, which does not lack electric drive, and the electric heating system has high electric heat conversion efficiency, generally exceeding 99%. Therefore, although this device requires a lot of electricity for heat storage and heat release, in fact, the total heat storage is the same as the traditional high-temperature heat storage, the total investment is lower, and the service life and safety of the equipment are also much better than the traditional high-temperature heat storage;
[0019] 4. Compared with the existing high-pressure heat storage tanks and phase change materials or heat transfer oils, the atmospheric pressure heat storage tank is not only low in cost, but also uses the same heat storage medium as the boiler, which can be better connected to the boiler and other subsequent systems without considering the isolation connection problem;
[0020] 5. This device can be used alone or in conjunction with a large-scale energy storage system to replace high-temperature heat storage. The ultimate goal of a large-scale energy storage system is generally to generate electricity. The electricity consumed by this system during the heat release process can be provided by the large-scale energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the specific implementation methods of the present utility model, the drawings required for use in the description of the specific implementation methods will be briefly introduced below. Obviously, the drawings in the following description are some implementation methods of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0022] Figure 1 This is a schematic diagram of the connection relationship of Example 1;
[0023] Figure 2 This is a schematic diagram of the connection relationship of Example 2.
[0024] In the figure, 1-electrode steam boiler; 2-superheater; 3-steam user; 4-normal pressure heat storage tank; 5-condensation return device; 6-heat exchanger; 7-motor; 8-air compressor; 9-salt cavern; 10-regenerative heat exchanger; 11-turbine; 12-generator. DETAILED DESCRIPTION
[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication or connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0026] Embodiment 1:
[0027] like Figure 1As shown, an electrode boiler energy storage device includes an electrode steam boiler 1 and a normal pressure heat storage tank 4, the normal pressure heat storage tank 4 is connected to a heat exchanger 6, in this embodiment, the heat exchanger 6 is a steam-water heat exchanger, which is used to convert the saturated steam of about 200°C generated by the electrode steam boiler 1 into hot water of about 90°C, which is stored in the normal pressure heat storage tank 4, the heat exchanger 6 is connected to the steam outlet of the electrode steam boiler 1, the water outlet of the normal pressure heat storage tank 4 is connected to the water inlet of the electrode steam boiler 1, the electrode steam boiler 1 is also connected to a steam user 3, in this embodiment, the steam user 3 is a high-temperature steam user, the electrode steam boiler 1 is connected to the high-temperature steam user through the superheater 2, the electrode steam boiler 1 generates saturated steam of about 200°C, and the superheater 2 heats the saturated steam of about 200°C to 300-400°C, the normal pressure heat storage tank 4 is connected to a condensation return water device 5, after the high-temperature steam user uses the steam, the steam is not discharged, then the condensed return water is collected in the condensation return water device 5, and then recycled to the normal pressure heat storage tank 4.
[0028] The working principle of this device is:
[0029] (1) Direct supply: Water is converted into saturated steam at about 200°C by the electrode steam boiler 1, and then transported to the superheater 2, where the saturated steam is heated to 300-400°C to become superheated steam, which is then directly transported to high-temperature steam users.
[0030] (2) Heat storage: Water is converted into saturated steam at about 200°C by the electrode steam boiler 1, and then the steam is converted into hot water by the steam-water heat exchanger and stored in the atmospheric pressure heat storage tank 4. The commonly used heat storage method is to use a high-pressure heat storage tank, but the cost of such a high-temperature water storage tank is very high and generally unaffordable; if it is replaced with phase change material or heat transfer oil, although the temperature can meet the requirements, there is a cycle life; after the utility model uses the atmospheric pressure heat storage tank 4, not only is the cost low, but the heat storage medium is also the same as that of the electrode steam boiler 1, which can be better connected to the boiler and other subsequent systems without considering the isolation connection problem. Its total heat storage is the same as that of the high-temperature heat storage method, but the temperature is lower.
[0031] (3) Heat release: When heat release is required, the hot water at about 90°C in the atmospheric heat storage tank 4 flows into the electrode steam boiler 1, and is converted into saturated steam at about 200°C by the electrode steam boiler 1 and transported to the superheater 2, where the saturated steam is heated to 300-400°C and converted into superheated steam. This realizes the conversion of low-temperature heat storage into high-temperature heat release. Generally, high-temperature heat storage only requires a small amount of electricity to drive the system to release heat. When the system releases heat, the electrode steam boiler 1 and the superheater 2 need to be turned on, which consumes electricity. However, this system is suitable for supporting large-scale energy storage systems and is used to replace high-temperature heat storage. The ultimate goal of large-scale energy storage systems is generally to generate electricity. The electricity consumed by this system during the heat release process can be provided by large-scale energy storage systems. Moreover, the electric heating system has a high electric-to-heat conversion efficiency, and the electric-to-heat conversion rate generally exceeds 99%. Therefore, although both heat storage and heat release require a large amount of electricity, the total heat storage is actually the same as that of traditional high-temperature heat storage. The total investment, life, and safety are also greatly superior to traditional high-temperature heat storage.
[0032] Embodiment 2:
[0033] like Figure 2 As shown, an electrode boiler energy storage device is used in an energy storage supporting system, including an electrode steam boiler 1 and a normal pressure heat storage tank 4. The temperature in the normal pressure heat storage tank 4 is generally around 90°C. The water outlet of the normal pressure heat storage tank 4 is connected to the water inlet of the electrode steam boiler 1. The electrode steam boiler 1 is also connected to a steam user 3. The heat storage tank 4 is connected to a heat exchanger 6. In this embodiment, the heat exchanger 6 is a heat storage heat exchanger. The heat exchanger 6 is connected to an electric motor 7 through an air compressor 8. The air compressor 8 compresses air to a high pressure, generally between 70 bar and 140 bar, through the power provided by the electric motor 7. The heat exchanger 6 is also connected to a salt cavern 9. Since the air will generate a large amount of internal energy when it is compressed, the heat is exchanged out through the heat storage heat exchanger and transported to the normal pressure heat storage tank 4 to cool down the air. The compressed air is then transported to the salt cavern 9, which is transformed from an abandoned salt mine and is used to store compressed air. The salt cavern 9 is connected to a regenerative heat exchanger 10, and the temperature required by the regenerative heat exchanger 10 increases the temperature of water in the atmospheric heat storage tank 4 through the electrode steam boiler 1. The regenerative heat exchanger 10 is connected to a turbine 11, and the air is depressurized through the turbine 11, and the compression potential energy is converted into kinetic energy. The regenerative heat exchanger 10 is used to heat the compressed air, so that the turbine 11 can continue to operate stably for a long time, so as to improve the efficiency of the turbine. One end of the turbine 11 is connected to a generator 12, which is used to convert the kinetic energy of the compressed air after the depressurization into electrical energy. The other end of the turbine 11 is connected to the steam outlet of the electrode steam boiler 1, and the generator 12 is respectively connected to the electrode steam boiler 1 and the motor 7 and provides them with electricity.
[0034] The working principle of the energy storage process of this system is to utilize the generator 12 to generate excess electricity, which is then passed through the motor 7, the air compressor 8, and the heat exchanger 6. In this embodiment, the heat exchanger 6 is a heat storage heat exchanger, which converts part of the excess electrical energy into thermal energy and stores it in the atmospheric pressure heat storage tank 4, and converts the other part of the electrical energy into compression potential energy and stores it in the salt cavern 9.
[0035] When the stored energy is needed, the compressed air in the salt cavern 9 is heated to the temperature required by the turbine 11 through the heat exchanger 10. The heat of the heat exchanger 10 comes from the heat stored in the atmospheric pressure heat storage tank 4, which is heated again by the electrode steam boiler 2. The heated compressed air is reduced in pressure through the turbine 11, and the compression potential energy is converted into kinetic energy to drive the generator 12 to generate electricity.
[0036] When electricity is abundant, industrial steam can even be directly provided to steam users 3 through electrode steam boiler 1 to avoid waste.
[0037] The above embodiments are used to describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of application of the present invention shall still fall within the scope of the patent coverage of the present invention.
Claims
1. An electrode boiler energy storage device, characterized in that: The invention comprises an electrode steam boiler (1) and a normal pressure heat storage tank (4), wherein the normal pressure heat storage tank (4) is connected to a heat exchanger (6), wherein a water outlet of the normal pressure heat storage tank (4) is connected to a water inlet of the electrode steam boiler (1), wherein the electrode steam boiler (1) is also connected to a steam user (3), wherein the heat exchanger (6) is a heat storage heat exchanger, wherein the heat exchanger (6) is connected to an electric motor (7) via an air compressor (8), wherein the heat exchanger (6) is connected to a salt cavern (9) for storing compressed air, wherein the salt cavern (9) is also connected to a heat recovery heat exchanger (10) for heating the compressed air.
2. The electrode boiler energy storage device according to claim 1, characterized in that: The steam user (3) is a high-temperature steam user, and the electrode steam boiler (1) is connected to the high-temperature steam user via a superheater (2).
3. The electrode boiler energy storage device according to claim 1, characterized in that: The atmospheric pressure heat storage tank (4) is connected to a condensation water return device (5), and the condensation water return device (5) is used to recover condensed water formed by the undischarged steam.
4. The electrode boiler energy storage device according to claim 1, characterized in that: The heat exchanger (6) can be replaced by a steam-water heat exchanger, and the heat exchanger (6) is connected to the steam outlet of the electrode steam boiler (1).
5. The electrode boiler energy storage device according to claim 1, characterized in that: The regenerative heat exchanger (10) is connected to a turbine (11) for reducing the pressure of compressed air, and the turbine (11) is connected to the steam outlet of the electrode steam boiler (1).
6. The electrode boiler energy storage device according to claim 5, characterized in that: The turbine (11) is also connected to a generator (12), and the generator (12) is respectively connected to the electrode steam boiler (1) and the electric motor (7) to provide electric power therefor.