CN112097556A - High-temperature electrochemical energy storage integrated system and method for calcium-based system - Google Patents
High-temperature electrochemical energy storage integrated system and method for calcium-based system Download PDFInfo
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- CN112097556A CN112097556A CN202011020770.4A CN202011020770A CN112097556A CN 112097556 A CN112097556 A CN 112097556A CN 202011020770 A CN202011020770 A CN 202011020770A CN 112097556 A CN112097556 A CN 112097556A
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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
- 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
- F28D2020/0065—Details, e.g. particular heat storage tanks, auxiliary members within tanks
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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
Abstract
A calcium-based system high-temperature electrochemical energy storage integrated system comprises a high-temperature electrochemical energy storage system and a chemical heat release system; the high-temperature electrochemical energy storage system comprises Ca (OH)2Storage bin, said Ca (OH)2The top of the storage bin is provided with a steam exhaust pipe (15), the side surface of the storage bin is provided with a mechanical rapping device (2), the lower part of the storage bin is provided with a rotary discharge valve (3), and the lower end of the rotary discharge valve is connected with a high-temperature electric energy storage reactor (4); the outlet end of the high-temperature electric energy storage reactor is connected with a bubbling bed (10); a high-temperature steam exhaust pipe (5) is arranged at the near outlet end of the high-temperature electric energy storage reactor; the chemical heat release system comprises a high-temperature CaO bin (6), a high-temperature mechanical rapping device (7) is arranged on the side surface of the high-temperature CaO bin, and a high-temperature rotary discharge valve (8) is arranged on the lower portion of the high-temperature CaO bin. The bubbling bed is internally provided with a buried pipe heat exchanger (11), and the top of the bubbling bed is provided with a steam conveying pipe (13).
Description
Technical Field
The invention relates to the technical field of electrochemical energy storage, and mainly relates to a high-temperature electrochemical energy storage integrated system and method of a calcium-based system.
Background
At present, the heat storage technology is mainly divided into three modes of sensible heat storage, latent heat storage and chemical heat storage. The sensible heat storage has small heat density, serious heat loss and short heat storage period; the problems of two-phase separation, material leakage, corrosion and the like exist in phase change heat storage; compared with the former two technologies, thermochemical energy storage has the obvious advantages of high energy storage density, high reaction temperature, small long-term heat storage loss and the like, and can effectively solve the problems of conversion, storage, transmission and high-temperature regeneration of electric energy. However, most of the existing researches on chemical energy storage are micro/small experimental researches on the characteristics of energy storage materials, a complete closed-loop system is rarely formed, and large-scale industrial application is not realized.
Fixed bed reactor pair Ca (OH)2/CaO+H2Basic experimental research of an O energy storage system shows that: by reacting with Ca (OH)2/CaO+H2The O energy storage system is subjected to 20 hydration-dehydration-rehydration cycle tests at different hydration pressures, and the experimental results show that: the heat energy supply at the maximum of 504 ℃ can be realized under the water vapor pressure of 150kPa, and in addition, the corresponding maximum heat output temperature reaches 455 ℃, 474 ℃ and 481 ℃ when the hydration pressure is respectively 70kPa, 110kPa and 130 kPa; in the 20-time circulation process, the reaction degree of the hydration process and the dehydration process is reduced along with the increase of the circulation number, and basically tends to be stable after the 10 th circulation, the hydration reaction fraction xh is between 0.8 and 0.9, and the dehydration reaction fraction xd is about 0.1. Experiments show that: in the 20 times of reaction circulation process, the average particle size of the reactant is increased along with the increase of the hydration pressure and the circulation times, but the reactant still keeps better reaction activity; a higher temperature thermal energy output can be provided at higher water vapor pressures.
Chinese patent CN2016102908087 discloses a fluidized calcium-based thermochemical high-temperature energy storage/release system and a working method thereof, wherein the system stores and releases energy by mutual conversion among solar energy, thermal energy and chemical energy by utilizing calcium-based thermochemical high-temperature reversible reaction. The system mainly comprises an energy input unit, an energy storage unit and an energy output unit. The fluidized calcium-based thermochemical high-temperature energy storage/release system comprises an energy input unit, an energy storage unit and an energy output unit, wherein the energy input unit comprises a solar heat absorber, an electric heater, a heavy oil storage tank, an oil feed pump and a first heating coil; the outlet of the heavy oil storage tank is connected with the inlet of an oil feeding pump through a pipeline, the outlet of the oil feeding pump is connected with the inlet of a second three-way valve, one outlet of the second three-way valve is connected with the inlet of an electric heater, the other outlet of the second three-way valve is connected with the inlet of a first three-way valve, one outlet of the first three-way valve is connected with the inlet of a solar heat absorber, the other outlet of the first three-way valve, the outlet of the solar heat absorber and the outlet of the electric heater are merged into the same pipeline and then connected with the inlet of a first heating coil, and the outlet of the first heating coil is connected with the inlet of the; the energy storage unit comprises a calcium-based reaction device, a cyclone separator, a horizontal boiling fluidized bed, an inertial separator, a second nitrogen storage tank, a first fan, a calcium hydroxide storage tank, a calcium oxide storage tank, a second fan, a third fan, a gas distributor, a first nitrogen storage tank, a steam-water separator and a first condenser; wherein, the gas outlet of the calcium-based reaction device is connected with the inlet of the cyclone separator, the solid outlet of the cyclone separator is connected with the solid inlet of the horizontal boiling fluidized bed, the gas outlet of the horizontal boiling fluidized bed is connected with the inlet of the inertial separator, the gas outlet of the inertial separator is connected with the inlet of the second nitrogen storage tank, the outlet of the second nitrogen storage tank is connected with the inlet of the first fan through an eighth valve, the outlet of the first fan is connected with the gas inlet of the horizontal boiling fluidized bed, the solid outlet of the inertial separator and the solid outlet of the horizontal boiling fluidized bed are merged into the same pipeline through the second valve and then connected with the inlet of a fourth three-way valve, one outlet of the fourth three-way valve is connected with the inlet of the calcium hydroxide storage tank, the other outlet of the calcium hydroxide storage tank is connected with the inlet of the calcium oxide storage tank, the outlet of the, An outlet of the calcium oxide storage tank is connected with a solid inlet of the calcium-based reaction device through a pipeline after passing through a fourth valve and an outlet of a second fan, a gas outlet of the cyclone separator is connected with an inlet of a steam-water separator through a first condenser, a liquid outlet of the steam-water separator is connected with a liquid inlet of a water storage tank of the energy output unit after passing through a seventh valve, a gas outlet of the steam-water separator is connected with an inlet of a first nitrogen storage tank, an outlet of the first nitrogen storage tank is connected with an inlet of the second fan through a fifth valve, the other outlet of the first nitrogen storage tank is connected with an inlet of a third fan through a 6 th valve, and an outlet of the third fan is connected with an inlet of a gas distributor; the energy output unit comprises a water storage tank, a feed pump, a second heating coil, a steam drum, a downcomer, a water-cooled wall, a steam pipeline, a superheater, a steam turbine, a generator and a second condenser.
CN2019110809903 discloses a magnesium-modified globular calcium-based thermochemical energy storage material and a preparation method thereof.
Disclosure of Invention
The invention aims to: the high-temperature electrochemical energy storage integrated system and the method of the calcium-based system can absorb renewable electric energy of wind power, water power and solar energy, and can also perform peak clipping and valley filling functions on thermal power, so that the electric energy is optimally and effectively utilized, the proportion of the electric energy in heating, production and life is improved, fossil fuel dispersion and low-efficiency application are reduced, and the emission of atmospheric pollutants is greatly reduced; creating better economic and social benefits.
The technical scheme of the invention is as follows: a calcium-based system high-temperature electrochemical energy storage integrated system and a method thereof are provided, wherein the electrochemical energy storage integrated system comprises a high-temperature electrochemical energy storage system and a chemical heat release system;
the high-temperature electrochemical energy storage system comprises Ca (OH)2Storage bin, said Ca (OH)2The top of the storage bin is provided with a steam exhaust pipe, the side surface of the storage bin is provided with a mechanical rapping device, the lower part of the storage bin is provided with a rotary discharge valve, the lower end of the rotary discharge valve is connected with a high-temperature electric energy storage reactor, and the near outlet end of the high-temperature electric energy storage reactor is provided with a high-temperature steam exhaust pipe;
the chemical heat release system comprises a high-temperature CaO bin, wherein a high-temperature mechanical rapping device is arranged on the side surface of the high-temperature CaO bin, a high-temperature rotary discharge valve is arranged on the lower part of the high-temperature CaO bin, the lower end of the high-temperature rotary discharge valve is connected with a high-temperature CaO feeding spiral inlet end, a high-temperature CaO feeding spiral outlet end is connected with a bubbling bed, a buried pipe heat exchanger is arranged in the bubbling bed, a steam material conveying pipe is arranged at the top of the bubbling bed, a steam inlet pipe is arranged on the lower part of the bubbling bed;
the outlet end of the high-temperature electric energy storage reactor is connected with a bubbling bed;
the bubbling bed passes through a vapor delivery pipe and Ca (OH)2The storage bins are connected.
Further, said Ca (OH)2The storage bin is in a funnel shape, and the blanking inclination angle of the storage bin is 50-75 degrees.
Furthermore, the high-temperature electric energy storage reactor is obliquely arranged and forms an included angle of 10-30 degrees with the horizontal plane.
Furthermore, the CaO bin is in a funnel shape, and the blanking inclination angle of the bin is 50-75 degrees.
Furthermore, the working temperature of the high-temperature electric energy storage reactor, the high-temperature CaO bin, the high-temperature mechanical rapping device, the high-temperature rotary discharge valve and the high-temperature CaO feeding screw is about 550 ℃.
Furthermore, the high-temperature mechanical rapping device is a motor cam rapping device, and can generate vertical vibration in a storage bin, the vibration stroke is 30-50mm, and the vibration frequency is 20-30 times/min.
Further, based on the calcium-based system high-temperature electrochemical energy storage integrated system and method, at the beginning of the energy storage stage, Ca (OH)2The powdery material in the storage bin falls into a high-temperature electric energy storage reactor which forms an inclination angle of 10-30 degrees with the horizontal plane through a rotary discharge valve under the action of a mechanical rapping device, a part which is made of heat-resistant steel and can be directly electrified and heated is arranged in the high-temperature electric energy storage reactor, the surface temperature can reach about 600 ℃, and the heat is fully transferred to Ca (OH)2When Ca (OH)2The high-temperature CaO powder and the water vapor are generated by pyrolysis reaction when the high-temperature CaO powder is heated to about 550 ℃, the electric energy is converted into chemical energy to be stored in CaO and is conveyed to a high-temperature CaO bin, the water vapor is discharged through a high-temperature steam discharge pipe near a discharge port of the high-temperature CaO bin, and the energy storage is finished. When the heat release stage begins, the powdery material with the temperature of about 550 ℃ in the high-temperature CaO bin falls into the high-temperature CaO feeding spiral through the high-temperature rotary discharge valve under the action of the high-temperature mechanical rapping deviceAnd then transferred into the bubbling bed. The steam generated by the steam generator is introduced from the bottom of the bed through the steam inlet pipe and undergoes hydration reaction with CaO in the bed to generate Ca (OH)2The powder and the released chemical heat are used for heating cold water in the buried pipe heat exchanger, and finally hot water is provided for a user, so that energy conversion and utilization from chemical energy to heat energy are completed. After the reaction is finished, the water vapor is used for one-time reaction of Ca (OH)2Blowing the powder out of the bubbling bed through a pneumatic conveying pipe to Ca (OH)2And in the storage bin, the water vapor is discharged through a steam discharge pipe at the top of the storage bin, and the heat release is finished.
Has the advantages that: the system realizes the integration of the high-temperature electrochemical energy storage system of the calcium-based system, and fills the blank of industrial application in related fields in China; the system can fully utilize low-cost off-peak electricity or surplus electricity in a power plant, realize the conversion from electric energy to chemical energy so as to be convenient for long-term storage, complete the conversion from the chemical energy to the heat energy when required, and provide high-quality hot water for users; the system can be used as an alternative energy source of fossil fuel and reduce SOX、NOXThe environment is protected by discharging pollutants; the system adopts a high-temperature chemical energy storage reactor directly heated by electricity and a buried-tube type efficient bubbling bed exothermic reactor, thereby improving the energy conversion efficiency and the utilization rate.
Drawings
Fig. 1 is a schematic diagram of a calcium-based system high-temperature electrochemical energy storage integrated system provided by the invention.
Description of reference numerals:
1Ca(OH)2the device comprises a storage bin, a 2 mechanical rapping device, a 3 rotary discharge valve, a 4 high-temperature electric energy storage reactor, a 5 high-temperature exhaust steam pipe, a 6 high-temperature CaO storage bin, a 7 high-temperature mechanical rapping device, a 8 high-temperature rotary discharge valve, a 9 high-temperature CaO feeding screw, a 10 bubbling bed, a 11 buried pipe heat exchanger, a 12 steam inlet pipe, a 13 steam material conveying pipe, a 14 steam generator and a 15 exhaust steam pipe.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The calcium-based system high-temperature electrochemical energy storage integrated system and method shown in fig. 1 comprise a high-temperature electrochemical energy storage system and a chemical heat release system.
The high-temperature electrochemical energy storage system comprises Ca (OH) which is in a funnel shape and has a blanking dip angle of 50-75 degrees2Storage bin 1, Ca (OH)2The top of the storage bin 1 is provided with a steam exhaust pipe 15 for exhausting gas, the side surface of the storage bin is provided with a mechanical rapping device 2 so as to be convenient for stable blanking, the lower part of the storage bin is provided with a rotary discharge valve 3 for feeding, the lower end of the rotary discharge valve 3 is connected with the inlet end of a high-temperature electric energy storage reactor 4, the high-temperature electric energy storage reactor 4 is obliquely arranged, the included angle between the high-temperature electric energy storage reactor 4 and the horizontal plane is 10-30 degrees, and the near outlet end of the high-temperature steam.
The chemical heat release system comprises a high-temperature CaO bin 6 which is in a funnel shape and has a blanking inclination angle of 50-75 degrees, a high-temperature mechanical rapping device 7 is arranged on the side surface of the high-temperature CaO bin 6 so as to stabilize blanking, a high-temperature rotary discharge valve 8 is arranged at the lower part of the high-temperature rotary discharge valve for feeding, the lower end of the high-temperature rotary discharge valve 8 is connected with the inlet end of a high-temperature CaO feeding screw 9, the outlet end of the high-temperature CaO feeding screw 9 is connected with a bubbling bed 10, a buried pipe heat exchanger 11 is arranged in the bubbling bed 10, a steam inlet pipe 12 is arranged at the lower part of2The storage bins 1 are connected.
The invention relates to a high-temperature electrochemical energy storage integrated system and a method of a calcium-based system, and the working process of the system comprises the following steps:
and (3) a high-temperature electrochemical energy storage stage: at the beginning of the energy storage phase, Ca (OH)2The powdery material in the storage bin 1 falls into a high-temperature electric energy storage reactor 4 which forms an inclination angle of 10-30 degrees with the horizontal plane through a rotary discharge valve 3 under the action of a mechanical rapping device 2, a part which is made of heat-resistant steel and can be directly electrified and heated is arranged in the high-temperature electric energy storage reactor 4, the surface temperature can reach about 600 ℃, and the heat is fully transferred to Ca (OH)2When Ca (OH)2The high-temperature CaO powder and the water vapor are generated by pyrolysis reaction when the high-temperature CaO powder is heated to about 550 ℃, the electric energy is converted into chemical energy to be stored in CaO and is conveyed to a high-temperature CaO bin 6, the water vapor is discharged through a high-temperature steam discharge pipe 5 near a discharge port of the high-temperature CaO bin 6, and the energy storage is finished.
A chemical exothermic phase: at the beginning of the exothermic phase, about 55% of the high-temperature CaO silo 6The powdery material with the temperature of 0 ℃ falls into a high-temperature CaO feeding screw 9 through a high-temperature rotary discharge valve 8 under the action of a high-temperature mechanical rapping device 7, and is further conveyed into a bubbling bed 10. Steam generated by the steam generator 14 is introduced from the bottom of the bed through the steam inlet pipe 12, and undergoes hydration reaction with CaO to generate Ca (OH)2The powder and the released chemical heat are used for heating cold water in the borehole heat exchanger 11, and finally hot water is provided for a user, so that energy conversion and utilization from chemical energy to heat energy are completed. After the reaction is finished, the water vapor is used for one-time reaction of Ca (OH)2The powder is blown out of the bubbling bed 10, conveyed pneumatically through the steam conveying pipe 13 to Ca (OH)2In the storage bin 1, water vapor is discharged through a steam discharge pipe 15 at the top of the storage bin, and the heat release is finished.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (7)
1. A calcium-based system high-temperature electrochemical energy storage integrated system is characterized by comprising a high-temperature electrochemical energy storage system and a chemical heat release system; the high-temperature electrochemical energy storage system comprises Ca (OH)2Storage bin, said Ca (OH)2The top of the storage bin is provided with a steam exhaust pipe (15), the side surface of the storage bin is provided with a mechanical rapping device (2), the lower part of the storage bin is provided with a rotary discharge valve (3), and the lower end of the rotary discharge valve is connected with a high-temperature electric energy storage reactor (4); the outlet end of the high-temperature electric energy storage reactor is connected with a bubbling bed (10); a high-temperature steam exhaust pipe (5) is arranged at the near outlet end of the high-temperature electric energy storage reactor;
the chemical heat release system comprises a high-temperature CaO bin (6), a high-temperature mechanical rapping device (7) is arranged on the side surface of the high-temperature CaO bin, a high-temperature rotary discharge valve (8) is arranged on the lower portion of the high-temperature CaO bin, the lower end of the high-temperature rotary discharge valve is connected with the inlet end of a high-temperature CaO feeding screw (9), the outlet end (9) of the high-temperature CaO feeding screw is connected with a bubbling bed (10), a buried pipe heat exchanger (11) is arranged in the bubbling bed, a steam conveying pipe (13) is arranged at the top of the bubbling bed, a steam inlet pipe (12) is arranged on the lower portion of the bubbling;
the bubbling bed passes through a vapor delivery pipe and Ca (OH)2The storage bins (1) are connected.
2. The calcium-based system high-temperature electrochemical energy storage integrated system as claimed in claim 1, wherein said Ca (OH)2The storage bin is in a funnel shape, and the included angle of funnel-shaped blanking of the storage bin, namely the inclination angle, is 50-75 degrees.
3. The calcium-based system high-temperature electrochemical energy storage integrated system as claimed in claim 1, wherein the high-temperature electrical energy storage reactor is arranged in an inclined manner, and the included angle between the high-temperature electrical energy storage reactor and the horizontal plane is 10-30 degrees.
4. The calcium-based system high-temperature electrochemical energy storage integrated system as claimed in claim 1, wherein the CaO storage bin is funnel-shaped, and the included angle (inclination angle) of hopper-shaped blanking of the bin is 50-75 °.
5. The calcium-based system high-temperature electrochemical energy storage integrated system as claimed in claim 1, wherein the high-temperature electrical energy storage reactor, the high-temperature CaO bin, the high-temperature mechanical rapping device, the high-temperature rotary discharge valve and the high-temperature CaO feeding screw have working temperatures of about 550 ℃.
6. The calcium-based system high-temperature electrochemical energy storage integrated system as claimed in claim 1, wherein the high-temperature mechanical rapping device is a motor cam rapping device, and can generate vertical vibration in a storage bin, the vibration stroke is 30-50mm, and the vibration frequency is 20-30 times/min.
7. Method of operation of a calcium-based system high-temperature electrochemical energy storage integrated system according to any of claims 1 to 6, characterized in that at the beginning of the energy storage phase, Ca (OH)2The powdery material in the storage bin falls into a high-temperature electric energy storage reactor which forms an inclination angle of 10-30 degrees with the horizontal plane through a rotary discharge valve under the action of a mechanical rapping device, and the high-temperature electric energy storage reactor stores high-temperature electric energyThe reactor is internally provided with a part which is made of heat-resistant steel and can be directly electrified and heated, the surface temperature can reach about 600 ℃, and the heat is fully transferred to Ca (OH)2When Ca (OH)2The high-temperature CaO powder and the water vapor are generated by pyrolysis reaction when the high-temperature CaO powder is heated to about 550 ℃, the electric energy is converted into chemical energy to be stored in CaO and is conveyed to a high-temperature CaO bin 6, the water vapor is discharged through a high-temperature steam discharge pipe near a discharge port of the high-temperature CaO bin 6, and the energy storage is finished; when the heat release stage begins, powdery materials at about 550 ℃ in the high-temperature CaO bin 6 fall into the high-temperature CaO feeding screw through the high-temperature rotary discharge valve under the action of the high-temperature mechanical rapping device, and are further conveyed into the bubbling bed; the steam generated by the steam generator is introduced from the bottom of the bed through the steam inlet pipe and undergoes hydration reaction with CaO in the bed to generate Ca (OH)2The chemical heat released by the powder is used for heating cold water in the pipe-buried heat exchanger, and finally hot water is provided for a user so as to complete energy conversion and utilization from chemical energy to heat energy; after the reaction is finished, the water vapor is used for one-time reaction of Ca (OH)2The powder is blown out of the bubbling bed 10, conveyed pneumatically through the steam conveying pipe to Ca (OH)2And in the storage bin, the water vapor is discharged through a steam discharge pipe at the top of the storage bin, and the heat release is finished.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113048826A (en) * | 2021-03-18 | 2021-06-29 | 江苏双良低碳产业技术研究院有限公司 | Calcium-based electrochemical heat storage system |
| CN116146960A (en) * | 2021-11-23 | 2023-05-23 | 洛阳瑞昌环境工程有限公司 | Thermochemical heat accumulation energy storage system and energy storage method |
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2020
- 2020-09-25 CN CN202011020770.4A patent/CN112097556A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113048826A (en) * | 2021-03-18 | 2021-06-29 | 江苏双良低碳产业技术研究院有限公司 | Calcium-based electrochemical heat storage system |
| CN116146960A (en) * | 2021-11-23 | 2023-05-23 | 洛阳瑞昌环境工程有限公司 | Thermochemical heat accumulation energy storage system and energy storage method |
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