CN113999655A - Heat storage device and method for inhibiting supercooling degree of sugar alcohol phase change heat storage material - Google Patents
Heat storage device and method for inhibiting supercooling degree of sugar alcohol phase change heat storage material Download PDFInfo
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- CN113999655A CN113999655A CN202111456384.4A CN202111456384A CN113999655A CN 113999655 A CN113999655 A CN 113999655A CN 202111456384 A CN202111456384 A CN 202111456384A CN 113999655 A CN113999655 A CN 113999655A
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- nitrogen
- erythritol
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
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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
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
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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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Abstract
The invention belongs to the technical field of heat storage, and particularly relates to a method and a device for inhibiting supercooling degree of an erythritol phase-change heat storage material. The low-temperature nitrogen bubbles are pumped into supercooled erythritol serving as cold sources, erythritol on the surfaces of the bubbles is rapidly cooled to form large temperature difference locally, and the erythritol on the surfaces has enough potential energy to overcome intermolecular hydrogen bond acting force, so that the erythritol are mutually aggregated to form supercooled erythritol solidification heat release in the crystal nucleus induction heat storage device. The device comprises a nitrogen generating device, a nitrogen cooling device, a nitrogen atomizing device and other components. The nitrogen generating device is used for generating the nitrogen required in the method, and the generated nitrogen firstly enters the nitrogen cooling device which cools the nitrogen to below 15 ℃ for strengthening the inhibiting effect on the supercooling behavior. The nitrogen atomization device is used for atomizing nitrogen in the pipeline into small bubbles, so that a plurality of inducible solidification points exist in erythritol, and the solidification rate and the heat release rate are accelerated.
Description
Technical Field
The invention belongs to the technical field of phase change heat storage materials, and particularly relates to a heat storage device and a suppression method for suppressing supercooling degree of a sugar alcohol phase change heat storage material.
Background
In order to realize the aim of double carbon, the consumption of fossil energy can be effectively reduced by using the medium-low temperature industrial waste heat for life heating in a phase-change heat storage mode. The erythritol serving as a food additive attracts attention in the field of medium-low temperature phase change heat storage due to the phase change temperature and the ultrahigh melting enthalpy value which are suitable for medium-low temperature waste heat utilization.
However, in the actual heat storage process, erythritol serves as a polyhydroxy compound, and strong intermolecular hydrogen bonding force enables the erythritol to have severe supercooling behavior, so that the latent heat of phase change stored due to melting of erythritol cannot be released by means of solidification.
The supercooling behavior of the erythritol means that the temperature of the molten erythritol is reduced along with the introduction of a heat exchange fluid in the heat release process after the erythritol is heated and melted, but the erythritol does not have the phenomenon of solidification and heat release after the temperature is lower than the melting point, the erythritol does not start to solidify and release heat until the temperature is reduced to dozens of degrees centigrade below the melting point, and the latent heat stored in the erythritol cannot be released if the cold flow temperature is higher than the solidification temperature. The supercooling behavior of erythritol must be suppressed in a manner.
Disclosure of Invention
The invention provides a heat storage device and a method for inhibiting supercooling degree of a sugar alcohol type phase change heat storage material, aiming at the technical problem that latent heat cannot be released in application of erythritol serving as the phase change heat storage material due to supercooling behavior of the erythritol.
The invention firstly provides a method for inhibiting the supercooling degree of an erythritol phase-change heat storage material, which comprises the following steps:
the nitrogen generator generates nitrogen, the nitrogen is subjected to low-temperature treatment and pressure flow parameter control, then the nitrogen is cut into small bubbles through the atomizing device, the small bubbles are used as cold sources and pumped into the supercooled erythritol, erythritol on the surfaces of the bubbles is rapidly cooled and forms great temperature difference with surrounding supercooled erythritol, and the erythritol on the surfaces of the bubbles has enough potential energy to overcome original solidification resistance, so that the supercooled erythritol forms crystal nuclei and then is solidified to release heat, and the supercooling degree of the erythritol is reduced.
As a preferable scheme of the invention, the temperature of the nitrogen after low-temperature treatment is not higher than 15 ℃. The pumping amount of nitrogen is not less than 2L/min per kilogram of erythritol.
As a preferred embodiment of the present invention, the nitrogen bubbles have a diameter of less than 1 cm.
The invention also provides a heat storage device for inhibiting the supercooling degree of the erythritol phase-change heat storage material, which comprises the following components: the system comprises a nitrogen generating device, a nitrogen cooling device, a pressure reducing valve, a flow control device, a one-way check valve, a nitrogen atomizing device and an erythritol phase change heat reservoir;
the nitrogen generating device, the nitrogen cooling device, the pressure reducing valve and the flow control device are sequentially connected through a nitrogen main pipeline; the nitrogen atomization devices are uniformly distributed at the bottom of the erythritol phase change heat reservoir, and the main nitrogen pipeline is respectively connected with the nitrogen atomization devices through nitrogen branches; each nitrogen branch is provided with a one-way check valve;
the erythritol phase-change heat storage device is characterized in that a working medium pipeline is arranged in the erythritol phase-change heat storage device, erythritol phase-change materials are filled between the working medium pipeline and the inner wall of the erythritol phase-change heat storage device, and a nitrogen outlet is formed in the top of the erythritol phase-change heat storage device.
As a preferred scheme of the invention, the nitrogen cooling device comprises a water jacket and a refrigeration water bath, a main nitrogen pipeline penetrates through the water jacket and exchanges heat with circulating water in the water jacket, the water jacket and the refrigeration water bath form water circulation through a pipeline, and the refrigeration water bath is used for generating circulating water with set temperature.
In a preferred embodiment of the present invention, the flow control device is a flow meter with a regulating function.
In a preferred embodiment of the present invention, the nitrogen gas atomizing device is an atomizer for generating nitrogen gas bubbles having a diameter of less than 1 cm.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method can greatly inhibit the supercooling degree of the erythritol on the premise of ensuring the heat storage density of the erythritol, can reduce the supercooling degree of the erythritol to be near 5 ℃ to the maximum, and has an inhibiting effect on the supercooling degree of the erythritol superior to that of other existing methods.
(2) The nitrogen bubbles used for inducing solidification are used as cold sources, and can also be used as protective gas to prolong the service life of erythritol used as a phase change heat storage material, so that the double-function nitrogen bubble phase change heat storage material has double functions.
(3) The method creatively enhances the inhibiting effect of nitrogen bubbles on the supercooling behavior of erythritol by carrying out low-temperature treatment on nitrogen.
(4) According to the invention, multiple positions in the erythritol can be simultaneously solidified and released by atomizing bubbles, so that the heat release rate of the erythritol is accelerated, and the heat exchange power of the phase-change heat storage unit is improved.
Drawings
FIG. 1 is a schematic structural diagram of a heat storage device for suppressing the supercooling degree of a sugar alcohol phase change heat storage material according to the present invention.
FIG. 2 is an internal temperature time curve of erythritol.
In the figure, 1-heat exchange pipeline, 2-phase change heat reservoir, 3-erythritol phase change material, 4-nitrogen atomization device (atomizer), 5-one-way check valve, 6-main pipeline, 7-gas flow regulator, 8-pressure reducing valve, 9-water jacket, 10-water bath reflux pipe, 11-water bath outflow pipe, 12-refrigeration water bath, and 13-nitrogen generation device (nitrogen pump).
Detailed Description
The following further describes the embodiments of the present invention with reference to the attached drawings. The embodiments of the present invention are not limited to the above embodiments, and all the technical ideas defined in the claims of the present invention and other simple changes based on the technical ideas are within the scope of the present invention.
As shown in fig. 1, the heat storage device for suppressing the supercooling degree of the erythritol phase-change heat storage material of the present embodiment includes: the device comprises a nitrogen generating device 13, a nitrogen cooling device, a pressure reducing valve 8, a flow control device, a one-way check valve 5, a nitrogen atomizing device and an erythritol phase change heat reservoir;
the nitrogen generating device 13, the nitrogen cooling device, the pressure reducing valve and the flow control device are sequentially connected through a nitrogen main pipeline; the nitrogen atomization devices are uniformly distributed at the bottom of the erythritol phase change heat reservoir, and the main nitrogen pipeline 6 is respectively connected with the nitrogen atomization devices through nitrogen branches; each nitrogen branch is provided with a one-way check valve;
a working medium pipeline is arranged in the erythritol phase-change heat reservoir, an erythritol phase-change material 3 is filled between the working medium pipeline and the inner wall of the erythritol phase-change heat reservoir, and a nitrogen outlet is formed in the top of the erythritol phase-change heat reservoir.
The nitrogen cooling device comprises a water jacket 9 and a refrigeration water bath 12, a nitrogen main pipeline penetrates through the water jacket 9 and exchanges heat with circulating water in the water jacket 9, the water jacket 9 and the refrigeration water bath 12 form water circulation through a water bath return pipe 10 and a water bath outflow pipe 11, and the refrigeration water bath 12 is used for generating circulating water at a set temperature.
The flow control device is a gas flow regulator 7 with a regulating function.
Case 1: the erythritol temperature in the phase-change heat storage module after heat charging is about 160 ℃. When heat release is started, cold flow at 80 ℃ enters the phase change heat reservoir 2 from the heat exchange pipeline 1, and the stored sensible heat of the erythritol is exchanged.
In a comparative embodiment, the nitrogen generation device is kept closed, the nitrogen atomization device does not work, the temperature of the erythritol is gradually reduced along with the heat release process, the erythritol does not have solidification behavior and releases stored latent heat when the temperature is reduced to about 118 ℃ (melting point), so that the erythritol enters a supercooled state, the erythritol does not have solidification behavior until the temperature is reduced to 80 ℃, a large amount of heat can not be released inside the heat storage unit, and the heat storage unit can not heat cold flow at 80 ℃.
In the embodiment of the present invention, when heat release is started, as shown in fig. 2000s, the nitrogen gas generation device 13 and the refrigeration water bath 12 are opened, and the flow rate of nitrogen gas is set to 5L/min, and the low-temperature nitrogen gas bubbles are started to be introduced into the erythritol in the supercooled state, so that the erythritol is rapidly solidified, and the stored latent heat is released.
The inhibitory effect of said case 1 on the supercooling behavior of erythritol is shown in fig. 2, and without using the method of the present invention, erythritol reaches a temperature of about 160 ℃ after completion of charging, at which time erythritol gradually decreases in temperature with the evolution of heat by passing through a cold flow of 80 ℃, but no solidification occurs until the temperature decreases to the same temperature as the cold flow temperature, which means that the latent heat stored in erythritol is not released. Under the inhibiting effect of the invention, with the introduction of nitrogen bubbles after cooling and atomization, erythritol begins to solidify and release heat when the temperature is reduced to 107.5 ℃, and the stored latent heat is released, so that the cold flow is heated.
Therefore, the supercooling degree of the erythritol can be greatly inhibited, the cold flow heat release of the erythritol phase-change heat storage device can be realized, and the application range of the erythritol phase-change heat storage device is greatly widened. Meanwhile, the nitrogen bubbles can also be used as protective gas to prolong the service life of erythritol serving as a phase-change heat storage material, and the double effects are achieved.
Claims (8)
1. A method for inhibiting supercooling degree of an erythritol phase-change heat storage material is characterized by comprising the following steps of:
the nitrogen generator generates nitrogen, the nitrogen is subjected to low-temperature treatment and pressure flow parameter control, then the nitrogen is cut into small bubbles through the atomizing device, the small bubbles are used as cold sources and pumped into the supercooled erythritol, erythritol on the surfaces of the bubbles is rapidly cooled and forms great temperature difference with surrounding supercooled erythritol, and the erythritol on the surfaces of the bubbles has enough potential energy to overcome original solidification resistance, so that the supercooled erythritol forms crystal nuclei and then is solidified to release heat, and the supercooling degree of the erythritol is reduced.
2. The method of claim 1, wherein the nitrogen is cryogenically treated to a temperature of no greater than 15 ℃.
3. The method according to claim 1, wherein the pumping amount of nitrogen is not less than 2L/min per kg of erythritol.
4. The method of claim 1, wherein the nitrogen bubbles are less than 1cm in diameter.
5. A heat storage device for inhibiting supercooling degree of erythritol phase-change heat storage materials is characterized by comprising: the device comprises a nitrogen generating device (13), a nitrogen cooling device, a pressure reducing valve, a flow control device, a one-way check valve, a nitrogen atomizing device and an erythritol phase change heat reservoir;
the nitrogen generating device (13), the nitrogen cooling device, the pressure reducing valve and the flow control device are sequentially connected through a nitrogen main pipeline; the nitrogen atomization devices are uniformly distributed at the bottom of the erythritol phase change heat reservoir, and the main nitrogen pipeline is respectively connected with the nitrogen atomization devices through nitrogen branches; each nitrogen branch is provided with a one-way check valve;
the erythritol phase-change heat storage device is characterized in that a working medium pipeline is arranged in the erythritol phase-change heat storage device, erythritol phase-change materials are filled between the working medium pipeline and the inner wall of the erythritol phase-change heat storage device, and a nitrogen outlet is formed in the top of the erythritol phase-change heat storage device.
6. The heat storage device according to claim 1, characterized in that the nitrogen cooling device comprises a water jacket (9) and a refrigeration water bath (12), a nitrogen main pipe passes through the water jacket (9) and exchanges heat with circulating water in the water jacket (9), the water jacket (9) and the refrigeration water bath (12) form a water circulation through a pipeline, and the refrigeration water bath (12) is used for generating circulating water with a set temperature.
7. Heat storage device according to claim 1, characterised in that the flow control device is a gas flow regulator (7) with regulating function.
8. The heat storage device of claim 1 wherein said nitrogen gas atomizing means is an atomizer for generating nitrogen gas bubbles having a diameter of less than 1 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111456384.4A CN113999655A (en) | 2021-12-01 | 2021-12-01 | Heat storage device and method for inhibiting supercooling degree of sugar alcohol phase change heat storage material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111456384.4A CN113999655A (en) | 2021-12-01 | 2021-12-01 | Heat storage device and method for inhibiting supercooling degree of sugar alcohol phase change heat storage material |
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| CN113999655A true CN113999655A (en) | 2022-02-01 |
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| CN202111456384.4A Withdrawn CN113999655A (en) | 2021-12-01 | 2021-12-01 | Heat storage device and method for inhibiting supercooling degree of sugar alcohol phase change heat storage material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220113094A1 (en) * | 2019-01-30 | 2022-04-14 | Siemens Gamesa Renewable Energy Gmbh & Co. Kg | Heat accumulator with pressure loss regulation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110114436A (en) * | 2016-11-02 | 2019-08-09 | 阿尔托大学注册基金会 | Cold crystallization material and the method that cold crystallization is utilized in heat storage |
| FR3082924A1 (en) * | 2018-06-22 | 2019-12-27 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | PHASE CHANGE MATERIAL (MCP) THERMAL STORAGE SYSTEM (SST) COMPRISING A GAS INJECTION CRYSTALLIZATION CONTROL DEVICE |
| CN112126413A (en) * | 2020-09-16 | 2020-12-25 | 银隆新能源股份有限公司 | Composite phase change material and preparation method thereof |
| CN112815756A (en) * | 2021-01-04 | 2021-05-18 | 浙江大学 | Heat storage phase change heat exchanger and method for promoting crystallization of sugar alcohol phase change material and reducing supercooling degree |
-
2021
- 2021-12-01 CN CN202111456384.4A patent/CN113999655A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110114436A (en) * | 2016-11-02 | 2019-08-09 | 阿尔托大学注册基金会 | Cold crystallization material and the method that cold crystallization is utilized in heat storage |
| FR3082924A1 (en) * | 2018-06-22 | 2019-12-27 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | PHASE CHANGE MATERIAL (MCP) THERMAL STORAGE SYSTEM (SST) COMPRISING A GAS INJECTION CRYSTALLIZATION CONTROL DEVICE |
| CN112126413A (en) * | 2020-09-16 | 2020-12-25 | 银隆新能源股份有限公司 | Composite phase change material and preparation method thereof |
| CN112815756A (en) * | 2021-01-04 | 2021-05-18 | 浙江大学 | Heat storage phase change heat exchanger and method for promoting crystallization of sugar alcohol phase change material and reducing supercooling degree |
Non-Patent Citations (3)
| Title |
|---|
| ERWIN P. ONA: "Relaxation of Supercooling of Erythritol for Latent Heat Storage", 《JOURNAL OF CHEMICAL ENGINEERING OF JAPAN》 * |
| MARIE DUQUESNE: "Nucleation Triggering of Highly Undercooled Xylitol Using an Air Lift Reactor for Seasonal Thermal Energy Storage", 《APPL. SCI. 》 * |
| SHENG YANG: "Suppressing the supercooling effect of erythritol by bubbling for latent heat storage", 《PROCEEDINGS OF THE ASME 2020 HEAT TRANSFER SUMMER CONFERENCE》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220113094A1 (en) * | 2019-01-30 | 2022-04-14 | Siemens Gamesa Renewable Energy Gmbh & Co. Kg | Heat accumulator with pressure loss regulation |
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Application publication date: 20220201 |