CN113048826A - Calcium-based electrochemical heat storage system - Google Patents
Calcium-based electrochemical heat storage system Download PDFInfo
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- CN113048826A CN113048826A CN202110290201.XA CN202110290201A CN113048826A CN 113048826 A CN113048826 A CN 113048826A CN 202110290201 A CN202110290201 A CN 202110290201A CN 113048826 A CN113048826 A CN 113048826A
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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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- Life Sciences & Earth Sciences (AREA)
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- Sustainable Energy (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Battery Electrode And Active Subsutance (AREA)
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 generated by the action 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 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; an unsaturated water outlet pipeline of the steam drum is in heat exchange connection with the evaporation heat exchanger, an outlet of the unsaturated water outlet pipeline is connected with the steam drum, and a 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. This application has realized the utilization to the electric energy of trough power consumption, can also realize the acquirement of hot steam simultaneously, provides low-priced, efficient energy for the user.
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
Since the 21 st century, the development trend of electrification and intellectualization is more obvious, and the demand of social electricity utilization is also increased year by year. In addition, as the proportion of renewable energy sources is continuously increased, the phenomenon of poor peak-valley load of a power grid is also becoming more and more serious. In order to improve the stability of the power grid and keep the balance of the power system, corresponding peak shaving measures are necessary when the power grid operates.
The conventional peak regulation method comprises thermal power generating unit peak regulation, water pumping energy storage, compressed air energy storage, solid heat storage, battery energy storage and the like, but the application scenes of the conventional peak regulation method are limited to a certain extent.
In summary, how to provide a heat storage system with good energy saving effect is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a calcium-based electrochemical heat storage system, which can be used for a user with a steam demand, and provide a cheaper and more efficient energy source for the user while performing peak clipping and valley filling on the power.
In order to achieve the above purpose, the invention provides the following technical scheme:
a calcium-based electrochemical thermal 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 generated by the action 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 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;
and an unsaturated water outlet pipeline of the steam drum is in heat exchange connection with the evaporation heat exchanger, an outlet of the unsaturated water outlet pipeline is connected with the steam drum, and a 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, a material outlet of the calcium oxide storage bin is connected with the fluidized bed heat exchanger through a screw conveyor, and a material outlet of the fluidized bed heat exchanger is connected with the calcium hydroxide storage bin through a conveyor.
Preferably, a fluidizing gas outlet of the fluidized bed heat exchanger is connected with a first separator for separating solids and gas, a gas outlet of the first separator is connected with a blower, gas outlet of the blower is used for driving the steam generator to feed gas into the fluidized bed heat exchanger, and a solids 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 of materials returned to the calcium oxide storage bin.
Preferably, the cooler is connected with a vacuum fan.
Preferably, a saturated steam outlet pipeline of the steam drum is connected with a superheated steam user device after exchanging heat 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 a valley, namely in the process of energy charging, the spiral heater works to convert electric energy into chemical energy of materials, namely, the spiral heater heats heat storage materials to generate water vapor, the generated water vapor enters a corresponding condensing system to be cooled, the heat generated in the cooling process can be supplied to users, or the heat energy is used for heating the water vapor, and cooling water can be stored; the material is heated by adopting a spiral heating mode, and the energy storage material is continuously turned by the spiral sheet in the heating process, so that the energy storage material is uniformly heated, and the heating efficiency is high.
In the energy release stage, water vapor is introduced into the fluidized bed heat exchanger to react with the material to generate a large amount of heat, and the heat of the material is collected through the steam superheating heat exchanger and the evaporation heat exchanger and is transferred to the steam.
This application can utilize calcium oxide warehouse, fluidized bed heat exchanger, calcium hydroxide warehouse and steam pocket to absorb the heat energy of material release high-efficiently, and the superheated steam of production can realize the purpose of energy storage, also can supply with steam simultaneously and give the user that needs hot steam. This application has realized the utilization to the electric energy of trough power consumption, can also realize the acquirement of hot steam simultaneously, provides low-priced, efficient energy for the user.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view of a calcium-based electrochemical heat storage system provided by the present invention.
In fig. 1, reference numerals include:
the system comprises a calcium oxide storage bin 1, a first air seal machine 2, a spiral conveyor 3, a fluidized bed heat exchanger 4, an evaporation heat exchanger 5, a first separator 6, an air seal machine 7, a conveyor 8, a calcium hydroxide storage bin 9, a second air seal machine 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-water superheated heat exchanger 20, a superheated steam outlet 21 and an air blower 22.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a calcium-based electrochemical heat storage system, which can be used for a user end with steam demand, and provides cheaper and more efficient energy for users while peak clipping and valley filling of electric power.
The application provides a calcium-based electrochemical heat storage system, the system constitutes mainly including:
the fluidized bed heat exchanger 4 is connected with the calcium oxide storage bin 1 for providing materials and the steam generator 16 for providing steam, and an evaporation heat exchanger 5 for collecting heat generated by the materials is arranged in the fluidized bed heat exchanger 4;
the calcium hydroxide storage bin 9 is connected with a 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 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;
and an unsaturated water outlet pipeline of the steam drum 17 is in heat exchange connection with the evaporation heat exchanger 5, an outlet of the unsaturated water outlet pipeline is connected with the steam drum 17, and a 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 connected in sequence to form an annular material flow line.
In the using process, the 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 and steam react in the fluidized bed heat exchanger 4 to generate heat, and the heat is absorbed by the evaporation heat exchanger 5. The reacted materials enter a calcium hydroxide storage bin 9 through a conveying device, the calcium hydroxide storage bin 9 can be used for storing calcium hydroxide, and the calcium hydroxide can be conveyed to a spiral heater 12 by utilizing a conveying device at an outlet of the calcium hydroxide storage bin. The spiral heater 12 can turn, push and heat the materials fully, form calcium oxide after being heated and decomposed, and convey the calcium oxide to the calcium oxide storage bin 1.
Because the unsaturated water 18 of the steam pocket 17 can exchange heat with the evaporation heat exchanger 5, the added heat in the fluidized bed heat exchanger 4 can be obtained, the unsaturated water 18 obtains the heat to form a saturated steam-water mixture 19 and then returns to the steam pocket 17, the steam-water mixture 19 returns to the steam pocket 17 and enters the steam superheating heat exchanger 20 from the gas outlet of the steam pocket 17, and because the calcium oxide returning from the spiral heater 12 is arranged in the calcium oxide storage bin 1, the temperature of the calcium oxide is high, the calcium oxide can be absorbed by the steam superheating heat exchanger 20 and the heat is transferred to the steam-water mixture through heat exchange, so that the temperature of the steam-water mixture is further increased, and superheated steam is formed.
When electricity is used in a valley, namely in the process of energy charging, the spiral heater 12 works to convert electric energy into chemical energy of materials, namely, the spiral heater 12 heats heat storage materials to generate water vapor, the generated water vapor enters a corresponding condensing system to be cooled, the heat generated in the cooling process can be supplied to users, or the heat energy is used for heating the water vapor, and cooling water can be stored; the material is heated by adopting a spiral heating mode, and the energy storage material is continuously turned by the spiral sheet in the heating process, so that the energy storage material is uniformly heated, and the heating efficiency is high.
In the energy release stage, the steam is introduced into the fluidized bed heat exchanger 4 to react with the materials to generate a large amount of heat, and the heat of the materials is collected through the steam superheating heat exchanger 20 and the evaporation heat exchanger 5 and is transferred to the steam.
The heat energy that the material released can be absorbed high-efficiently to this application by utilizing calcium oxide warehouse 1, fluidized bed heat exchanger 4, calcium hydroxide warehouse 9 and steam pocket 17, and the purpose of energy storage can be realized to the superheated steam of production, also can supply with steam simultaneously for the user that needs hot steam. This application has realized the utilization to the electric energy of trough power consumption, can also realize the acquirement of hot steam simultaneously, provides low-priced, efficient energy for the user.
On the basis of any one of the above embodiments, 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.
The screw conveyor 3 is adopted to convey materials, so that the conveying flow of the materials can be greatly reduced, and the conveying device is simple, convenient and quick, and the structure of the whole system can be more compact.
On the basis of the above embodiment, the fluidizing gas outlet of the fluidized bed heat exchanger 4 is connected to the first separator 6 for separating solid and gas, the gas outlet of the first separator 6 is connected to the blower 22, the outlet gas of the blower 22 is used for driving the steam generator 16 to feed gas into the fluidized bed heat exchanger 4, and the solid outlet of the first separator 6 is connected to 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 to the fluidized bed heat exchanger 4, and meanwhile, a circulating 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 in sequence is also formed by circulating pushing of the blower 22.
The solid outlet of the first separator 6 is connected with a conveyor 8, and the material is conveyed to a calcium hydroxide storage bin 9 by the conveyor 8, and the conveyor 8 can be a screw conveyor or other type of conveyor.
On the basis of the above 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 spiral heater 12 is connected with the calcium oxide storage bin 1.
The second separator 13 serves as a separation means capable of separating the steam and the calcium oxide for transportation and storage of the hot steam and the hot calcium oxide, respectively.
Optionally, the steam superheating heat exchanger 20 of the calcium oxide storage bin 1 is used for absorbing heat of the materials returned to the calcium oxide storage bin 1.
The cooler 14 may be connected to a vacuum fan 15 for discharging the cooling gas in 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 exchanging heat with the steam superheating heat exchanger 20. The superheated steam user device may store superheated steam or be used to deliver superheated steam to a user's steam consuming equipment.
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 process, so that the system structure is more compact.
When the calcium-based electrochemical heat storage system releases energy, water vapor generated by the steam generator 16 is mixed with fluidizing gas at the outlet of the blower 22 and then is sent to the fluidized bed heat exchanger 4, the water vapor and the energy storage material react to release heat, and the fluidizing gas is separated from material particles by the separator 6 and then returns to the blower 22 for circulation again.
The material autoxidation calcium storage bin 1 is sent into one side of a fluidized bed heat exchanger 4 through a first air seal machine 2 and a screw conveyer 3, is discharged from the other side of the fluidized bed heat exchanger 4 after reacting with water vapor, and the discharged material is sent to a calcium hydroxide storage bin 9 through an air seal machine 7 and a conveyer 8.
When the system releases energy, the steam generation 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 to generate a saturated steam-water mixture 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 to generate superheated steam.
When the calcium-based electrochemical heat storage system is charged, the energy storage material is conveyed from the calcium hydroxide storage bin 9 to the spiral heater 12 through the second air seal machine 10 and the pipe chain conveyor 11, and the energy storage material is continuously overturned and pushed in the spiral heater 12, is heated, decomposed and conveyed to the calcium oxide storage bin 1.
The material is 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 material is separated from the water vapor by the second separator 13, the material is sent into the calcium oxide storage bin 1, and the non-condensable gas is discharged by the vacuum fan 15.
Because of adopting fluidized bed heat exchanger 4 in this application, can promote chemical reaction's abundant degree, after the reaction, the reaction rate among the material component is high. The heat exchange coefficient between 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 between the material and the metal is greatly enhanced, and the heat exchange efficiency during energy release can be effectively improved.
In addition to the calcium-based electrochemical heat storage system provided in the above embodiments, please refer to the prior art for the structure of other parts of the calcium-based electrochemical heat storage system, which is not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred 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 are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. A calcium-based electrochemical thermal storage system, comprising:
the fluidized bed heat exchanger (4) is connected with a calcium oxide storage bin (1) for providing materials and a steam generator (16) for providing steam, and an evaporation heat exchanger (5) for collecting heat generated by the action 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 used for heating materials and conveying the materials to the calcium oxide storage bin (1), and a material outlet of the spiral heater (12) is connected with a material inlet of the calcium oxide storage bin (1);
the steam drum (17), the unsaturated water outlet pipeline of the steam drum (17) with the evaporation heat exchanger (5) heat exchange connection, the exit linkage of unsaturated water outlet pipeline the steam drum (17), the saturated vapour outlet pipeline of the steam drum (17) with the superheated steam heat exchanger (20) heat exchange connection of calcium oxide warehouse (1).
2. The calcium-based electrochemical heat storage system according to claim 1, characterized in that the material outlet of the calcium oxide silo (1) is connected to the fluidized bed heat exchanger (4) by a screw conveyor (3), and the material outlet of the fluidized bed heat exchanger (4) is connected to the calcium hydroxide silo (9) by a conveyor (8).
3. The steam generating calcium-based electrochemical heat storage system according to claim 1, wherein the fluidizing gas outlet of the fluidized bed heat exchanger (4) is connected with a first separator (6) for separating solid and gas, the gas outlet of the first separator (6) is connected with a blower (22), the outlet gas of the blower (22) is used for driving the steam generator (16) to feed gas into the fluidized bed heat exchanger (4), and the solid outlet of the first separator (6) is connected with the conveyor (8).
4. Calcium-based electrochemical heat storage system according to any one of claims 1 to 3, characterized in that the gas outlet 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 storage bin (1).
5. Calcium-based electrochemical thermal storage system according to claim 4, characterized in that the solids outlet of the spiral heater (12) is connected to the calcium oxide storage bin (1).
6. The calcium-based electrochemical thermal storage system according to claim 4, wherein the steam superheating heat exchanger (20) of the calcium oxide silo (1) is adapted to absorb heat returned to the material in the calcium oxide silo (1).
7. Calcium-based electrochemical heat storage system according to claim 4, characterized in that the cooler (14) is connected to a vacuum fan (15).
8. The calcium-based electrochemical heat storage system according to any one of claims 1 to 3, wherein a saturated steam outlet pipeline of the steam drum (17) is connected with a superheated steam user device after exchanging heat with the steam superheating heat exchanger (20).
9. Calcium-based electrochemical heat storage system according to any one of claims 1 to 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| WO2024103646A1 (en) * | 2021-11-23 | 2024-05-23 | 洛阳瑞昌环境工程有限公司 | Thermochemical heat-accumulation energy-storage heat supply system, and energy-storage heat supply method |
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| CN105737658A (en) * | 2016-04-30 | 2016-07-06 | 华南理工大学 | Fluidization calcium-based thermal-chemical high temperature energy storing/releasing system and working method thereof |
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