CN113048826B - Calcium-based electrochemical heat storage system - Google Patents
Calcium-based electrochemical heat storage system Download PDFInfo
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- CN113048826B CN113048826B CN202110290201.XA CN202110290201A CN113048826B CN 113048826 B CN113048826 B CN 113048826B CN 202110290201 A CN202110290201 A CN 202110290201A CN 113048826 B CN113048826 B CN 113048826B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/003—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using thermochemical reactions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/08—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being steam
- F22B1/10—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being steam released from heat accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D13/00—Heat-exchange apparatus using a fluidised bed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
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Abstract
The invention discloses a calcium-based electrochemical heat storage system, which comprises: the fluidized bed heat exchanger is connected with a calcium oxide storage bin for providing materials and a steam generator for providing steam, and an evaporation heat exchanger for collecting heat of the materials is arranged in the fluidized bed heat exchanger; the calcium hydroxide storage bin is connected with a material outlet of the fluidized bed heat exchanger; the spiral heater is connected with a material outlet of the calcium hydroxide storage bin and is used for heating materials and conveying the materials to the calcium oxide storage bin, and the material outlet of the spiral heater is connected with a material inlet of the calcium oxide storage bin; the unsaturated water outlet pipeline of the steam drum is in heat exchange connection with the evaporation heat exchanger, the outlet of the unsaturated water outlet pipeline is connected with the steam drum, and the saturated steam outlet pipeline of the steam drum is in heat exchange connection with the steam superheating heat exchanger of the calcium oxide storage bin. The application realizes the utilization of the electric energy of the trough electricity, and simultaneously can also realize the acquisition of the hot steam, thereby providing cheap and efficient energy for users.
Description
Technical Field
The invention relates to the technical field of chemical heat storage, in particular to a calcium-based electrochemical heat storage system.
Background
In the 21 st century, the development trend of electrification and intellectualization is more obvious, and the demand of social electricity is also increased year by year. In addition, as the proportion of renewable energy sources is continuously increased, the phenomenon of peak-to-valley load difference of the power grid is also becoming serious. In order to improve the stability of the power grid and keep the balance of the power system, corresponding peak regulation measures are necessary to be adopted when the power grid runs.
The conventional peak shaving method comprises peak shaving of a thermal power generating unit, pumping and storing energy, compressed air storing energy, solid heat storage, battery storing energy and the like, but has certain limitation on application scenes.
In summary, how to provide a heat storage system with good energy saving effect is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention aims to provide a calcium-based electrochemical heat storage system, which can be used for supplying cheaper and more efficient energy to users while cutting peak and filling valley of electric power.
In order to achieve the above object, the present invention provides the following technical solutions:
a calcium-based electrochemical heat storage system comprising:
the fluidized bed heat exchanger is connected with a calcium oxide storage bin for providing materials and a steam generator for providing steam, and an evaporation heat exchanger for collecting heat of the materials is arranged in the fluidized bed heat exchanger;
the calcium hydroxide storage bin is connected with a material outlet of the fluidized bed heat exchanger;
the spiral heater is connected with the material outlet of the calcium hydroxide storage bin and is used for heating materials and conveying the materials to the calcium oxide storage bin, and the material outlet of the spiral heater is connected with the material inlet of the calcium oxide storage bin;
the unsaturated water outlet pipeline of the steam drum is in heat exchange connection with the evaporation heat exchanger, the outlet of the unsaturated water outlet pipeline is connected with the steam drum, and the saturated steam outlet pipeline of the steam drum is in heat exchange connection with the steam superheating heat exchanger of the calcium oxide storage bin.
Preferably, the material outlet of the calcium oxide storage bin is connected with the fluidized bed heat exchanger through a screw conveyor, and the material outlet of the fluidized bed heat exchanger is connected with the calcium hydroxide storage bin through a conveyor.
Preferably, the fluidization gas outlet of the fluidized bed heat exchanger is connected with a first separator for separating solids and gas, the gas outlet of the first separator is connected with a blower, the gas outlet of the blower is used for driving the steam generator to enter the fluidized bed heat exchanger, and the solid outlet of the first separator is connected with the conveyor.
Preferably, the exhaust hole of the spiral heater is connected with a second separator, the gas outlet of the second separator is connected with a cooler, and the solid outlet of the second separator is connected with the calcium oxide storage bin.
Preferably, the solid outlet of the spiral heater is connected with the calcium oxide storage bin.
Preferably, the steam superheating heat exchanger of the calcium oxide storage bin is used for absorbing heat returned to the materials in the calcium oxide storage bin.
Preferably, the cooler is connected with a vacuum fan.
Preferably, the saturated steam outlet pipeline of the steam drum is connected with a superheated steam user device after heat exchange with the steam superheating heat exchanger.
Preferably, the material outlet of the calcium hydroxide storage bin is connected with the spiral heater through a pipe chain conveyor.
When electricity is used in the valley, namely in the energy charging process, the spiral heater is used for working to convert electric energy into chemical energy of materials, namely the spiral heater is used for heating heat storage materials to generate water vapor, the generated water vapor enters a corresponding condensation system to be cooled, heat generated in the cooling process can be supplied to a user, or heat energy can be used for heating the vapor, and cooling water can be stored; the spiral heating mode is adopted to heat the material, and the spiral sheets are continuously turned over the energy storage material in the heating process, so that the energy storage material is heated uniformly, and the heating efficiency is high.
In the energy release stage, a great amount of heat is generated by leading the water vapor into the fluidized bed heat exchanger to perform chemical reaction with the materials, and the heat of the materials is collected by the steam superheating heat exchanger and the evaporation heat exchanger and is transferred to the steam.
This application can utilize calcium oxide storehouse, fluidized bed heat exchanger, calcium hydrate storehouse and steam pocket to absorb the heat energy of material release effectively, and the superheated steam of production can realize the purpose of energy storage, also can supply steam simultaneously for the user that needs hot steam. The application realizes the utilization of the electric energy of the trough electricity, and simultaneously can also realize the acquisition of the hot steam, thereby providing cheap and efficient energy for users.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a calcium-based electrochemical heat storage system provided by the invention.
In fig. 1, reference numerals include:
the device comprises a calcium oxide storage bin 1, a first air shutter 2, a spiral conveyor 3, a fluidized bed heat exchanger 4, an evaporation heat exchanger 5, a first separator 6, an air shutter 7, a conveyor 8, a calcium hydroxide storage bin 9, a second air shutter 10, a pipe chain conveyor 11, a spiral heater 12, a second separator 13, a cooler 14, a vacuum fan 15, a steam generator 16, a steam drum 17, unsaturated water 18, a steam-water mixture 19, a steam superheating heat exchanger 20, a superheated steam outlet 21 and a blower 22.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The core of the invention is to provide a calcium-based electrochemical heat storage system which can be oriented to a user end with steam demand, and provides cheaper and more efficient energy for users while cutting peaks and filling valleys of electric power.
The application provides a calcium-based electrochemical heat storage system, the system mainly comprises:
a fluidized bed heat exchanger 4 connected with the calcium oxide storage bin 1 for providing materials and the steam generator 16 for providing steam, wherein an evaporation heat exchanger 5 for collecting heat of the materials is arranged in the fluidized bed heat exchanger 4;
a calcium hydroxide storage bin 9 connected with the material outlet of the fluidized bed heat exchanger 4;
the spiral heater 12 is connected with a material outlet of the calcium hydroxide storage bin 9 and is used for heating materials and conveying the materials to the calcium oxide storage bin 1, and the material outlet of the spiral heater 12 is connected with a material inlet of the calcium oxide storage bin 1;
the unsaturated water outlet pipeline of the steam drum 17 is in heat exchange connection with the evaporation heat exchanger 5, the outlet of the unsaturated water outlet pipeline is connected with the steam drum 17, and the saturated steam outlet pipeline of the steam drum 17 is in heat exchange connection with the steam superheating heat exchanger 20 of the calcium oxide storage bin 1.
Referring to fig. 1, in the system, a calcium oxide storage bin 1, a fluidized bed heat exchanger 4, a calcium hydroxide storage bin 9 and a spiral heater 12 are sequentially connected to form an annular material flow line.
In the use process, materials in the calcium oxide storage bin 1 can enter the fluidized bed heat exchanger 4 through the conveying device, the fluidized bed heat exchanger 4 is connected with the steam supply device (the steam generator 16), calcium oxide reacts with steam in the fluidized bed heat exchanger 4 to generate heat, and the heat is absorbed by the evaporation heat exchanger 5. The reacted material enters the calcium hydroxide storage bin 9 through a conveying device, and the calcium hydroxide storage bin 9 can be used for storing calcium hydroxide and can be used for conveying the calcium hydroxide to the spiral heater 12 by utilizing a conveying device at the outlet of the calcium hydroxide storage bin. The spiral heater 12 can fully overturn, push and heat the materials, form calcium oxide after being heated and decomposed, and convey the calcium oxide to the calcium oxide storage bin 1.
Since the unsaturated water 18 of the steam drum 17 can exchange heat with the evaporation heat exchanger 5, more heat in the fluidized bed heat exchanger 4 can be obtained, and the unsaturated water 18 obtains heat to form a saturated steam-water mixture 19 and then returns to the steam drum 17 again, the steam-water mixture 19 returns to the steam drum 17, and enters the superheated steam heat exchanger 20 from the gas outlet of the steam drum 17, and since the calcium oxide warehouse 1 has the calcium oxide returning from the spiral heater 12, the calcium oxide warehouse has higher temperature, can be absorbed by the superheated steam heat exchanger 20 and transfers the heat to the steam-water mixture, thereby further increasing the temperature of the steam-water mixture and forming superheated steam.
When electricity is used in the valley, namely in the charging process, the spiral heater 12 is used for working to convert electric energy into chemical energy of materials, namely the spiral heater 12 is used for heating heat storage materials to generate water vapor, the generated water vapor enters a corresponding condensing system to be cooled, heat generated in the cooling process can be supplied to users, or heat energy can be used for heating the steam, and cooling water can be stored; the spiral heating mode is adopted to heat the material, and the spiral sheets are continuously turned over the energy storage material in the heating process, so that the energy storage material is heated uniformly, and the heating efficiency is high.
In the energy release phase, a great amount of heat is generated by introducing water vapor into the fluidized bed heat exchanger 4 to chemically react with the material, and the heat of the material is collected by the steam superheating heat exchanger 20 and the evaporation heat exchanger 5 and transferred to the steam.
The utility model discloses can utilize calcium oxide storehouse 1, fluidized bed heat exchanger 4, calcium hydrate storehouse 9 and steam pocket 17 to absorb the heat energy that the material released high-efficiently, the superheated steam of production can realize the purpose of energy storage, also can supply steam simultaneously for the user who needs hot steam. The application realizes the utilization of the electric energy of the trough electricity, and simultaneously can also realize the acquisition of the hot steam, thereby providing cheap and efficient energy for users.
On the basis of any embodiment, the material outlet of the calcium oxide storage bin 1 is connected with the fluidized bed heat exchanger 4 through the screw conveyor 3, and the material outlet of the fluidized bed heat exchanger 4 is connected with the calcium hydroxide storage bin 9 through the conveyor 8.
Adopt screw conveyer 3 transmission material, the transport flow of material that can significantly reduce, simple and convenient and swift to can make the structure of entire system compacter.
On the basis of the embodiment, the fluidization gas outlet of the fluidized bed heat exchanger 4 is connected with the first separator 6 for separating solids and gas, the gas outlet of the first separator 6 is connected with the blower 22, the air outlet of the blower 22 is used for driving the steam generator 16 to enter the fluidized bed heat exchanger 4, and the solid outlet of the first separator 6 is connected with the conveyor 8.
The separator can be used for separating gaseous substances and solid substances, has various separation modes and can realize the separation of different phase substances.
The blower 22 is used for conveying the steam of the steam generator 16 into the fluidized bed heat exchanger 4, and a circulation loop from the fluidizing gas outlet of the fluidized bed heat exchanger 4 to the first separator 6, the blower 22 and the steam inlet of the fluidized bed heat exchanger 4 is also formed by the blower 22 in turn to be circulated.
The solids outlet of the first separator 6 is connected to a conveyor 8 and the material is conveyed by the conveyor 8 into a calcium hydroxide silo 9, the conveyor 8 may be a screw conveyor or other type of conveyor.
On the basis of the embodiment, the exhaust hole of the spiral heater 12 is connected with the second separator 13, the gas outlet of the second separator 13 is connected with the cooler 14, and the solid outlet of the second separator 13 is connected with the calcium oxide storage bin 1.
Optionally, the solid outlet of the screw heater 12 is connected to the calcium oxide cartridge 1.
The second separator 13 serves as a separation device capable of separating steam and calcium oxide for the transportation and storage of hot steam and hot calcium oxide, respectively.
Optionally, the steam superheating heat exchanger 20 of the calcium oxide silo 1 is used to absorb heat returned to the material in the calcium oxide silo 1.
A vacuum fan 15 may be connected to the line of the cooler 14 to discharge the cooling gas from the cooler 14.
On the basis of any one of the above embodiments, the saturated steam outlet pipeline of the steam drum 17 is connected with a superheated steam user device after heat exchange with the steam superheating heat exchanger 20. The superheated steam consumer device may store superheated steam or be used to deliver superheated steam to a consumer's steam consuming device.
On the basis of any one of the above embodiments, the material outlet of the calcium hydroxide storage bin 9 is connected with a spiral heater 12 through a pipe chain conveyor 11. The pipe chain conveyor 11 can greatly reduce the material conveying flow, so that the system structure is more compact.
When the calcium-based electrochemical heat storage system releases energy, the water vapor generated by the vapor generator 16 is mixed with fluidization gas at the outlet of the air blower 22 and then sent to the fluidized bed heat exchanger 4, the water vapor reacts with the energy storage materials to release heat, and the fluidization gas returns to the air blower 22 after the material particles are separated by the separator 6 for recycling.
The material is sent into one side of the fluidized bed heat exchanger 4 from the calcium oxide storage bin 1 through the first air seal device 2 and the screw conveyor 3, is discharged from the other side of the fluidized bed heat exchanger 4 after reacting with water vapor, and is sent to the calcium hydroxide storage bin 9 from the air seal device 7 and the conveyor 8.
When the system releases energy, the steam generating system absorbs heat to generate steam, saturated water in the steam drum 17 enters the evaporation heat exchanger 5 in the fluidized bed heat exchanger 4, a saturated steam-water mixture is generated and then returns to the steam drum 17, and the saturated steam enters the steam superheating heat exchanger 20 positioned in the calcium oxide storage bin 1 from the upper part of the steam drum 17 so as to produce superheated steam.
When the calcium-based electrochemical heat storage system is charged, the energy storage materials are sent to the spiral heater 12 from the calcium hydroxide storage bin 9 through the second air seal 10 and the pipe chain conveyor 11, and the energy storage materials are continuously overturned and pushed in the spiral heater 12, heated, decomposed and conveyed to the calcium oxide storage bin 1.
The materials are heated and decomposed in the spiral heater 12 to obtain water vapor, the water vapor is cooled into water through the cooler 14 after the materials are separated by the second separator 13, the materials are sent into the calcium oxide storage bin 1, and the non-condensable gas is discharged by the vacuum fan 15.
In the application, the fluidized bed heat exchanger 4 is adopted, so that the full degree of chemical reaction can be improved, and the reaction rate in the material components is high after the reaction. The heat exchange coefficient of the material (calcium oxide) and the metal is lower, and the fluidized bed heat exchanger 4 is provided with a metal heat exchange surface in a dense phase area, so that the heat exchange coefficient of the material and the metal is greatly enhanced, and the heat exchange efficiency in energy release can be effectively improved.
In addition to the calcium-based electrochemical heat storage system provided in the above embodiments, the structure of each other portion of the calcium-based electrochemical heat storage system is referred to in the prior art, and will not be described herein.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The calcium-based electrochemical heat storage system provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (9)
1. A calcium-based electrochemical heat storage system, comprising:
a fluidized bed heat exchanger (4) connected with a calcium oxide storage bin (1) for providing materials and a steam generator (16) for providing steam, wherein the materials in the calcium oxide storage bin (1) and the steam react in the fluidized bed heat exchanger (4) to generate heat, and an evaporation heat exchanger (5) for collecting the heat of the materials is arranged in the fluidized bed heat exchanger (4);
the calcium hydroxide storage bin (9) is connected with the material outlet of the fluidized bed heat exchanger (4);
the spiral heater (12) is connected with a material outlet of the calcium hydroxide storage bin (9) and is used for heating materials to form calcium oxide and conveying the materials to the calcium oxide storage bin (1), and the material outlet of the spiral heater (12) is connected with a material inlet of the calcium oxide storage bin (1);
the unsaturated water outlet pipeline of the steam drum (17) is in heat exchange connection with the evaporation heat exchanger (5), the outlet of the unsaturated water outlet pipeline is connected with the steam drum (17), and the saturated steam outlet pipeline of the steam drum (17) is in heat exchange connection with the steam superheating heat exchanger (20) of the calcium oxide storage bin (1).
2. The calcium-based electrochemical heat storage system according to claim 1, characterized in that the material outlet of the calcium oxide storage bin (1) is connected with the fluidized bed heat exchanger (4) through a screw conveyor (3), and the material outlet of the fluidized bed heat exchanger (4) is connected with the calcium hydroxide storage bin (9) through a material outlet conveyor (8).
3. The calcium-based electrochemical heat storage system according to claim 2, characterized in that the fluidization gas outlet of the fluidized bed heat exchanger (4) is connected with a first separator (6) for separating solids and gas, the gas outlet of the first separator (6) is connected with a blower (22), the gas outlet of the blower (22) is used for driving the steam generator (16) to enter the fluidized bed heat exchanger (4), and the solid outlet of the first separator (6) is connected with the material outlet conveyor (8).
4. A calcium-based electrochemical heat storage system according to any one of claims 1-3, characterized in that the exhaust hole of the spiral heater (12) is connected to a second separator (13), the gas outlet of the second separator (13) is connected to a cooler (14), and the solid outlet of the second separator (13) is connected to the calcium oxide cartridge (1).
5. The calcium-based electrochemical heat storage system according to claim 4, characterized in that the solid outlet of the spiral heater (12) is connected to the calcium oxide cartridge (1).
6. The calcium-based electrochemical heat storage system according to claim 4, characterized in that the steam superheating heat exchanger (20) of the calcium oxide cartridge (1) is used for absorbing heat returned to the material in the calcium oxide cartridge (1).
7. The calcium-based electrochemical heat storage system according to claim 4, characterized in that the cooler (14) is connected to a vacuum fan (15).
8. A calcium-based electrochemical heat storage system according to any one of claims 1-3, characterized in that the saturated steam outlet line of the drum (17) is connected to a superheated steam consumer device after heat exchange with the steam superheating heat exchanger (20).
9. A calcium-based electrochemical heat storage system according to any one of claims 1-3, characterized in that the material outlet of the calcium hydroxide storage bin (9) is connected to the spiral heater (12) by a pipe chain conveyor (11).
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| CN219083857U (en) * | 2021-11-23 | 2023-05-26 | 洛阳瑞昌环境工程有限公司 | Thermochemical heat accumulation energy storage heating system |
| CN115117904A (en) * | 2022-08-29 | 2022-09-27 | 中国能源建设集团山西省电力勘测设计院有限公司 | Energy storage and discharge method for peak shaving operation of cogeneration unit |
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| CN105737658B (en) * | 2016-04-30 | 2018-09-14 | 华南理工大学 | Fluidization calcium base thermochemical high temperature energy storage/release energy system and its working method |
| CN107559161B (en) * | 2017-10-09 | 2019-05-31 | 上海海事大学 | A kind of thermal and electric two way system of combination chemical heat accumulation and power generation with sea water |
| DK3712549T3 (en) * | 2017-11-16 | 2023-12-11 | Ihi Corp | ENERGY STORAGE DEVICE |
| CN110360862A (en) * | 2019-07-02 | 2019-10-22 | 清华大学 | Solid Jie's energy-storage system and method based on fluidized bed heating |
| CN112097556A (en) * | 2020-09-25 | 2020-12-18 | 江苏双良锅炉有限公司 | High-temperature electrochemical energy storage integrated system and method for calcium-based system |
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