CN115597417A - Three-phase thermochemical heat storage device based on porous hydrophobic membrane - Google Patents

Three-phase thermochemical heat storage device based on porous hydrophobic membrane Download PDF

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Publication number
CN115597417A
CN115597417A CN202211216047.2A CN202211216047A CN115597417A CN 115597417 A CN115597417 A CN 115597417A CN 202211216047 A CN202211216047 A CN 202211216047A CN 115597417 A CN115597417 A CN 115597417A
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heat
liquid
porous hydrophobic
hydrophobic membrane
heat storage
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叶碧翠
王征
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Zhejiang Sci Tech University ZSTU
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Zhejiang Sci Tech University ZSTU
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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
    • F28D20/023—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material being enclosed in granular particles or dispersed in a porous, fibrous or cellular structure
    • 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
    • F28D20/028—Control arrangements therefor
    • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Sorption Type Refrigeration Machines (AREA)

Abstract

The invention provides a three-phase thermochemical heat storage device based on a porous hydrophobic film, which comprises: the absorption/adsorption reactor comprises a first heat insulation shell, a micro-needle rib array plate component and a porous hydrophobic membrane, wherein an absorption/adsorption channel is formed between the micro-needle rib array plate component and the porous hydrophobic membrane, and a heat storage medium is arranged in the absorption/adsorption channel; a condenser/evaporator disposed above the absorption/adsorption reactor, the porous hydrophobic membrane separating the absorption/adsorbent channels from a condenser/evaporator interior space; and the liquid storage tank is connected with the condenser/evaporator through a liquid pumping pipeline and a liquid drainage pipeline. According to the three-phase thermochemical heat storage device based on the porous hydrophobic film, disclosed by the invention, three-phase chemical heat storage is realized by utilizing the micro-needle rib array plate component and the porous hydrophobic film, the heat storage density and the heat storage and release reaction rate are improved, meanwhile, a liquid heat storage medium is prevented from entering a condenser/evaporator, the control is convenient, and the heat absorption and release work is stable.

Description

Three-phase thermochemical heat storage device based on porous hydrophobic membrane
Technical Field
The invention relates to the technical field of application of heat and mass transfer enhancement and phase-change heat storage systems, in particular to a three-phase thermochemical heat storage device based on a porous hydrophobic film.
Background
In order to realize the comprehensive utilization of renewable energy and industrial waste heat resources, the implementation of an efficient energy storage technology is a necessary means for solving the problems of instantaneity and instability of renewable energy and waste heat resources and mismatching of energy supply and demand. The heat energy and cold energy in the global user terminal requirements account for about half of the total energy consumption, so the heat storage technology is widely concerned.
The heat storage technology comprises three main heat storage modes of sensible heat, latent heat and thermochemical heat storage, and compared with the two thermochemical heat storage modes, the heat storage technology has the characteristics of high heat storage density, small heat loss in long-period heat storage and the like, and is considered to be a long-period cross-season heat storage technology with great application prospect. The thermochemical absorption/adsorption heat storage system has the characteristics of environmental friendliness and low regeneration temperature, can regulate and control the heat energy quality in the heat storage and release process by changing pressure parameters, meets the storage and supply requirements of different grades of heat energy/cold energy, is particularly suitable for the storage of heat energy/cold energy in a medium-low temperature region at-20-250 ℃ and the supply requirement of heat energy/cold energy in buildings or industries, and has higher comprehensive utilization efficiency of energy.
Through the literature search of the prior art, chinese patent application No. CN 101855508A discloses a thermochemical heat storage device, which uniformly supplies water supplied to a container upward to a heat storage material through a water flow path and a dispersion plate on the lower side of a heat exchanger, thereby realizing the uniform mixing and heat dissipation process of the heat storage material and the water, and the design can prevent the heat storage material from entering the inside of the water flow path. The device adopts three-phase thermochemistry heat storage, but the heat dissipation process adopts two phases, which is not beneficial to improving the mass transfer rate and the heat release rate.
Chinese patent application nos. CN 103256729A and CN108548443A disclose two thermo-chemical heat storage devices. The two patents realize the separation and combination of the refrigerant steam and the heat storage material through the connection of the reactor, the evaporator/condenser and the refrigerant liquid storage device. However, this device can achieve only two-phase thermochemical heat storage, limiting the increase in the storage density. Meanwhile, once the heat storage material is liquefied in the heat dissipation process, the heat storage material in the patent CN 103256729A enters the refrigerant reservoir through the valve, or the gaseous refrigerant channel in the patent CN108548443A is submerged, so that the control difficulty is increased, and the stability of the device is tested.
Disclosure of Invention
In view of this, the present invention provides a three-phase thermochemical heat storage apparatus based on porous hydrophobic film, which improves heat transfer and mass transfer efficiency of the heat storage apparatus, further improves heat storage and heat release rate, and simultaneously improves heat storage density and ensures stable operation of the heat storage apparatus, to overcome the disadvantages of the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a three-phase thermochemical heat storage device based on porous hydrophobic membranes, comprising:
the absorption/adsorption reactor comprises a first heat insulation shell, a micro-needle rib array plate component and a porous hydrophobic membrane, wherein an absorption/adsorption agent channel is formed between the micro-needle rib array plate component and the porous hydrophobic membrane, and a heat storage medium is arranged in the absorption/adsorption agent channel; a cold/heat source channel is formed between the microneedle rib array plate assembly and the first insulating shell, and the cold/heat source channel is communicated with a heat source through a cold/heat source outlet and a cold/heat source inlet or supplies heat to the outside;
a condenser/evaporator disposed above the absorption/adsorption reactor, the porous hydrophobic membrane separating the absorption/adsorbent channels from a condenser/evaporator interior space;
the liquid storage tank is connected with the condenser/evaporator through a liquid pumping pipeline and a liquid discharge pipeline;
in the heat absorption mode, a heat storage medium is decomposed into a gaseous refrigerant and a solid crystal under the action of a heat source, the gaseous refrigerant enters a condenser/evaporator through a porous hydrophobic membrane for condensation, the condensed refrigerant is stored in a liquid storage tank through a liquid drainage pipeline, and the solid crystal is attached to the surface of a microneedle rib plate on a microneedle rib array plate assembly; in the heat release mode, a refrigerant in the liquid storage tank is pumped to the condenser/evaporator through a pump liquid pipeline, the refrigerant is gasified under the action of evaporation heat, moves to the absorption/adsorbent channel through the porous hydrophobic membrane, and performs chemical reaction with solid crystals on the ribbed plate of the microneedle to release heat, and heat is supplied to a user after heat exchange through the cold/heat source channel.
Further, micropin rib array board subassembly still includes first baffle the top of first baffle sets up micropin floor and second baffle, the micropin floor is in be the array form and arranges on the first baffle, the second baffle sets up the outside of micropin floor, the absorption/adsorbent passageway forms between porous hydrophobic membrane, second baffle, the first baffle.
Further, the first partition plate and the porous hydrophobic membrane are arranged in parallel, and the microneedle rib plate and the first partition plate are arranged vertically.
Furthermore, the microneedle rib plate is arranged in a tapered shape from one end close to the first partition plate to one end close to the porous hydrophobic membrane.
Further, the first partition plate covers the entire inner cross section of the first insulating case, and a dispersion hole is formed in the first partition plate, wherein the dispersion hole and the cold and heat source inlet are formed at opposite ends of the cold/heat source passage, and the cold and heat source inlet and the cold and heat source outlet are formed at the same side of the cold/heat source passage.
Furthermore, a plurality of microneedle rib plates are arranged below the first partition plate, and the microneedle rib plates are uniformly arranged on the lower surface of the first partition plate in an array manner.
Further, the transverse cross-sectional area inside the absorption/adsorption reactor is larger than the transverse cross-sectional area inside the condenser/evaporator, the first insulating housing and the second insulating housing of the condenser/evaporator are in sealing assembly connection through a flange, and the length of the porous hydrophobic membrane in the transverse direction is equal to the length of the condenser/evaporator in the transverse direction.
Further, a refrigerant tray is arranged in the condenser/evaporator, a heat exchange coil is wound on the refrigerant tray, a refrigerant outlet and a liquid inlet are respectively arranged at two ends of the pump liquid pipeline, the refrigerant outlet is arranged on the bottom wall of the refrigerant tray, and the liquid inlet is arranged in the liquid storage tank; and a liquid outlet and a refrigerant inlet are respectively arranged at two ends of the liquid drainage pipeline, the liquid outlet is arranged in the liquid storage tank, and the refrigerant inlet is arranged in the condenser/evaporator.
Furthermore, the liquid inlet is arranged at the upper end of the liquid storage tank, the liquid outlet is arranged at the lower end of the liquid storage tank, the refrigerant inlet is arranged above the refrigerant tray, a channel for refrigerant steam to circulate is arranged in the center of the refrigerant tray, the top of the refrigerant tray is arranged in an open manner, the pump liquid pipeline and the liquid discharge pipeline are in an on-off state by controlling a valve to cut off the pipeline, and a liquid discharge pump is arranged on the liquid discharge pipeline.
Furthermore, a maintenance opening is arranged on the liquid discharge pipeline, and the liquid inlet is arranged between the maintenance opening and the refrigerant outlet.
Compared with the prior art, the three-phase thermochemical heat storage device based on the porous hydrophobic film has the following advantages:
(1) The three-phase thermochemical heat storage device based on the porous hydrophobic membrane realizes three-phase chemical heat storage by utilizing the micro-needle rib array plate component and the porous hydrophobic membrane, improves the heat storage density and the heat storage and release reaction rate, simultaneously avoids liquid heat storage medium from entering a condenser/evaporator, prevents an absorption/adsorbent channel from being blocked in a heat absorption state or submerged in a heat release state, is convenient to control, and has stable heat absorption and heat release work.
(2) According to the three-phase thermochemical heat storage device based on the porous hydrophobic membrane, the microneedle rib plate is arranged in the cold/heat source channel, so that the included angle between the flow speed direction of the cold and heat source and the temperature gradient is favorably reduced, and the efficiency of convective heat transfer is further enhanced; the microneedle rib plate array arranged in the absorption/adsorption agent channel is beneficial to forming a uniformly distributed thin liquid film, and the enhancement of heat transfer in the vertical direction is beneficial to increasing the vaporization core and promoting the evaporation of water on the surface of the liquid film.
(3) According to the three-phase thermochemical heat storage device based on the porous hydrophobic membrane, the microneedle rib plate array can provide a crystallization core in the absorption/adsorbent channel, so that nucleation and growth of crystals on the surface of the microneedle rib plate are promoted, crystal deposition on the surface of the porous membrane and the surface of the liquid membrane is avoided, evaporation of water on the surface of the liquid membrane is enhanced, the specific surface area of the crystals is increased, and the exothermic reaction rate is increased.
(4) According to the three-phase thermochemical heat storage device based on the porous hydrophobic membrane, the water vapor transmission channel is constructed by utilizing the pore structure of the porous hydrophobic membrane, so that the contact area between the absorption/adsorption agent channel and water vapor is increased, the heat and mass transfer effects of inorganic salt and water vapor in the absorption/adsorption reactor are enhanced by combining the factors, and the heat storage density and the heat storage reaction rate are favorably and synergistically improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a three-phase thermochemical heat storage apparatus according to an embodiment of the invention;
FIG. 2 is a schematic top view of an absorption/adsorption reactor according to an embodiment of the present invention;
FIG. 3 is a schematic side view of an absorption/adsorption reactor according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a water vapor transmission channel constructed by water vapor passing through pores of a porous hydrophobic membrane according to an embodiment of the present invention;
description of the reference numerals:
1-a liquid storage tank; 2-a liquid discharge port; 3-a liquid discharge pump; 4-discrete holes; 5-microneedle rib plates; 6-absorption/adsorption reactor; 61-a first insulating housing; 7-cold and heat source outlet; 8-a control valve; 9-a liquid inlet; 10-access hole; 11-a refrigerant inlet; 12-a refrigerant outlet; 13-a refrigerant tray; 14-cold and heat source inlet; 15-heat exchange coil; 16-an absorption/adsorbent channel; 18-microneedle rib array plate assembly; 19-a first separator; 20-porous hydrophobic membranes; 21-condenser/evaporator; 211-a second insulated enclosure; 22-a second separator; 23-cold/heat source channel; 24-water vapor.
Detailed Description
In order to make the technical means, objectives and functions of the present invention easy to understand, the following detailed description of the embodiments of the present invention with reference to the specific drawings.
It should be noted that all terms used in the present invention for directional and positional indication, such as: the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "top", "lower", "transverse", "longitudinal", "center", and the like are used only for explaining the relative positional relationship, the connection, and the like between the respective members in a certain state (as shown in the drawings), and are only for convenience of describing the present invention, and do not require that the present invention must be constructed and operated in a certain orientation, and thus, should not be construed as limiting the present invention. In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1 to 4, the invention discloses a three-phase thermochemical heat storage device based on a porous hydrophobic film, comprising:
the absorption/adsorption reactor 6 comprises a first heat insulation shell 61, a micro-needle rib array plate assembly 18 and a porous hydrophobic membrane 20, an absorption/adsorption channel 16 is formed between the micro-needle rib array plate assembly 18 and the porous hydrophobic membrane 20, and a heat storage medium is arranged in the absorption/adsorption channel 16; a cold/heat source channel 23 is formed between the microneedle rib array plate assembly 18 and the first insulating housing 61, and the cold/heat source channel 23 is communicated with a heat source through a cold/heat source outlet 7 and a cold/heat source inlet 14 or supplies heat to the outside;
a condenser/evaporator 21 disposed above the absorption/adsorption reactor 6, the porous hydrophobic membrane 20 separating the absorption/adsorbent channel 16 from the interior space of the condenser/evaporator 21;
the liquid storage tank 1 is connected with the condenser/evaporator 21 through a liquid pumping pipeline and a liquid discharge pipeline;
in the heat absorption mode, the heat storage medium is decomposed into gaseous refrigerant and solid crystals under the action of a heat source, the gaseous refrigerant enters the condenser/evaporator 21 through the porous hydrophobic membrane 20 to be condensed, the condensed refrigerant is stored in the liquid storage tank 1 through the liquid drainage pipeline, and the solid crystals are attached to the surfaces of the microneedle rib plates 5 on the microneedle rib array plate assembly 18; in the heat release mode, the refrigerant in the liquid storage tank 1 is pumped to the condenser/evaporator 21 through a pump liquid pipeline, the refrigerant is gasified under the action of evaporation heat, moves to the absorption/adsorbent channel 16 through the porous hydrophobic membrane 20, and is subjected to chemical reaction with the solid crystals on the microneedle rib plate 5 to release heat, and heat is exchanged through the cold/heat source channel 23 to supply heat to a user.
According to the three-phase thermochemical heat storage device based on the porous hydrophobic membrane, when heat storage media arranged in an absorption/adsorption reactor 6 are in a liquid state in an initial heat absorption state, the liquid heat storage media are limited in an absorption/adsorption agent channel 16 between a microneedle rib array plate assembly 18 and the porous hydrophobic membrane 20, when heat absorption starts, a heat source supplies heat to a cold/heat source channel 23 through a cold and heat source inlet 14, gaseous refrigerants (such as water vapor) and solid crystals (such as inorganic salt particles) are separated out from the liquid heat storage media in the absorption/adsorption agent channel 16, the liquid heat storage media are limited in the absorption/adsorption agent channel 16 under the action of the porous hydrophobic membrane 20, the gasified refrigerants pass through the porous hydrophobic membrane 20 and enter a condenser/evaporator 21 to be condensed, and the separated solid crystals of the liquid heat storage media are attached to the microneedles 5 under the action of the microneedle rib plate 5 on the microneedle rib plate assembly 18, so that the microneedle heat storage/adsorption agent channel 16 is prevented from being blocked in the heat absorption state and the absorption/adsorption agent channel 16 is prevented from being submerged in the heat release state; the refrigerant condensed in the condenser/evaporator 21 is stored in the liquid storage tank 1 through a liquid discharge pipeline, and after the heat absorption process is finished, a control valve between the refrigerant outlet 12 and the liquid storage tank 1 is closed. Similarly, in the heat release process, the control valve between the refrigerant outlet 12 and the liquid storage tank 1 is opened, the refrigerant in the liquid storage tank 1 is pumped to the condenser/evaporator 21 through the pump liquid pipeline, the refrigerant passes through the porous hydrophobic membrane 20 after evaporation and gasification and undergoes a chemical reaction (such as a water chemical reaction) with the solid crystal on the microneedle rib plate 5 to release heat, and at the moment, the cold and heat source outlet 7 and the cold and heat source inlet 14 of the cold/heat source channel 23 are communicated with the medium to be heated of the user through the control valve 8, so that heat supply for the user is realized.
The three-phase thermochemical heat storage device with the porous hydrophobic membrane realizes three-phase chemical heat storage by utilizing the micro-needle rib array plate component 18 and the porous hydrophobic membrane 20, improves heat storage density and heat storage and release reaction rate, simultaneously avoids liquid heat storage media from entering the condenser/evaporator 21, avoids the absorption/adsorbent channel 16 from being blocked in a heat absorption state or submerged in a heat release state, is convenient to control, and has stable heat absorption and heat release work.
As a preferred example of the present invention, the micro needle rib array plate assembly 18 further includes a first spacer 19, a micro needle rib plate 5 and a second spacer 22 are disposed above the first spacer 19, the micro needle rib plates 5 are arranged in an array on the first spacer 19, the second spacer 22 is disposed outside the micro needle rib plate 5, and the absorbent/adsorbent channel 16 is formed between the porous hydrophobic membrane 20, the second spacer 22 and the first spacer 19. As an example of the present invention, the first separator 19 is a metal separator.
This setting discloses a formation structure of absorption/ adsorbent passageway 16, 5 arrays of micropin floor through setting up in absorption/adsorbent passageway 16 are favorable to forming evenly distributed's thin liquid film, be favorable to improving heat-retaining rate and heat-retaining density, simultaneously, because 5 arrays of micropin floor can provide the crystallization core in inorganic salt passageway, promote the nucleation and the growth of crystal at 5 surfaces of micropin floor, avoid porous hydrophobic membrane 20 surface and liquid film surface crystal deposition, not only be favorable to strengthening the evaporation of liquid film surface moisture, be favorable to increasing crystal specific surface area again, promote exothermic reaction rate.
Preferably, the first separator 19 and the porous hydrophobic film 20 are arranged in parallel, and the microneedle rib plate 5 and the first separator 19 are arranged perpendicularly.
The arrangement is favorable for increasing the vaporization core through the enhancement of heat transfer in the vertical direction, promotes the evaporation of water on the surface of the liquid film, and further improves the heat storage rate.
Preferably, the microneedle ribs 5 are arranged to have a tapered cross section from the end close to the first separator 19 to the end close to the porous hydrophobic membrane 20.
The arrangement further improves the efficiency of the adsorption growth or chemical reaction of the crystal on the microneedle rib plate 5, and promotes the rate of endothermic/exothermic reaction.
As a preferred example of the present invention, the first partition plate 19 covers the entire inner cross-section of the first insulating case 61, and the first partition plate 19 is provided with the dispersing holes 4, wherein the dispersing holes 4 and the cold heat source inlet 14 are provided at opposite ends of the cold/heat source passage 23, and the cold heat source inlet 14 and the cold heat source outlet 7 are provided at the same side of the cold/heat source passage 23.
This arrangement allows the heat source or the cold source to exchange heat through the heat transfer passage formed between the first partition 19 and the second partition 22 and surrounding the outside of the absorbent/adsorbent passage 16 after entering the cold/heat source passage 23 through the cold/heat source inlet 14, then to enter the interior of the cold/heat source passage 23 below the first partition 19 through the dispersion holes 4, and finally to be discharged through the cold/heat source outlet 7. This arrangement further improves the efficiency of heat absorption or heat release of the absorption/adsorption reactor 6 by restricting the flow path inside the cold/heat source passage 23.
As a preferred example of the present invention, a plurality of microneedle ribs 5 are provided under the first partition 19, and the microneedle ribs 5 are arranged in a uniform array on the lower surface of the first partition 19. Preferably, the microneedle rib plate 5 on the upper surface of the first partition 19 and the microneedle rib plate 5 on the lower surface of the first partition 19 are symmetrically arranged.
The microneedle rib plate 5 array arranged in the cold/heat source channel 23 is beneficial to reducing the included angle between the flow velocity direction of the cold/heat source and the temperature gradient, further enhances the efficiency of convective heat transfer, and ensures the reliability of heat absorption and heat release.
As a preferred example of the present invention, the transverse cross-sectional area inside the absorption/adsorption reactor 6 is larger than the transverse cross-sectional area inside the condenser/evaporator 21, the first heat-insulating housing 61 and the second heat-insulating housing 211 of the condenser/evaporator 21 are connected by flange-sealing fitting, and the length of the porous hydrophobic membrane 20 in the transverse direction is equal to the length of the condenser/evaporator 21 in the transverse direction. Preferably, the porous hydrophobic membrane 20 may be provided in a plurality of layers.
According to the three-phase thermochemical heat storage device based on the porous hydrophobic film, the porous hydrophobic film 20 is arranged at the joint of the absorption/adsorption reactor 6 and the condenser/evaporator 21, a water vapor transmission channel is constructed by using a porous film pore structure, meanwhile, a liquid heat storage medium is prevented from passing through, the contact area of inorganic salt and water vapor is increased, and the reliability of heat absorption and heat release of the three-phase thermochemical heat storage device is ensured.
Specifically, as shown in fig. 4, microneedle rib plates 5 arranged in an array are disposed on both the upper and lower surfaces of the first partition plate 19, a space for storing a heat storage medium is formed between the first partition plate 19 and the porous hydrophobic film 20, the microneedle rib plates 5 form a crystal core of inorganic salt crystals precipitated from the heat storage medium in a heat absorption process, an absorption/adsorption agent channel 16 for flowing water vapor is formed between the microneedle rib plates 5, the heat storage medium forms a water vapor liquid film along the microneedle rib plates 5 in a heat absorption state, the water vapor 24 finally flows to the condenser/evaporator 21 through a water vapor transmission channel constructed by a pore structure of the porous hydrophobic film 20, and the liquid heat storage medium is still isolated in the absorption/adsorption agent channel 16, so as to achieve a heat absorption function of the three-phase thermochemical heat storage device, the heat release function of the three-phase thermochemical heat storage device is similar to the above-mentioned scheme, and no further description is repeated here.
As a preferred example of the present invention, a refrigerant tray 13 is disposed inside the condenser/evaporator 21, a heat exchange coil 15 is wound on the refrigerant tray 13, a refrigerant outlet 12 and a liquid inlet 9 are respectively disposed at two ends of the pumping liquid pipe, the refrigerant outlet 12 is disposed on a bottom wall of the refrigerant tray 13, and the liquid inlet 9 is disposed inside the liquid storage tank 1; the two ends of the liquid discharge pipeline are respectively provided with a liquid discharge port 2 and a refrigerant inlet 11, the liquid discharge port 2 is arranged inside the liquid storage tank 1, and the refrigerant inlet 11 is arranged inside the condenser/evaporator 21. Preferably, the liquid inlet 9 is arranged at the upper end of the liquid storage tank 1, the liquid outlet 2 is arranged at the lower end of the liquid storage tank 1, the refrigerant inlet 11 is arranged above the refrigerant tray 13, the pump liquid pipeline and the liquid discharge pipeline are in a state of cutting off the on-off state of the pipelines through a control valve, and the liquid discharge pipeline is provided with the liquid discharge pump 3. As an example of the present invention, the refrigerant tray 13 has a channel at the center thereof for circulating refrigerant vapor, and the top of the refrigerant tray 13 is opened.
As a preferred example of the present invention, a service opening 10 is provided on the liquid discharge pipe, and the liquid inlet 9 is provided between the service opening 10 and the refrigerant outlet 12. An on-off valve is arranged between the access hole 10 and the liquid inlet 9, and the access hole 10 can be used for vacuumizing.
As a preferred example of the present invention, an auxiliary electric heating device is provided on the liquid storage tank 1.
The invention relates to a three-phase thermochemical heat storage device based on a porous hydrophobic film, which is used for realizing a control method of an adjustable step phase change heat storage device and comprises the following steps:
before the three-phase thermochemical heat storage device based on the porous hydrophobic membrane is used, the access hole 10 of the device is communicated with a vacuum pump for vacuum pumping, a proper amount of refrigerant is added into the liquid storage tank 1, and the access hole 10 is closed after the addition is finished.
And (3) heat absorption process: the heat absorption process begins with the heat storage medium in the absorber/adsorber channel 16 being a liquid. The heat source enters a heat transfer channel formed between the first partition 19 and the second partition 22 (i.e., a channel above the first partition 19 of the cold/heat source channel 23, which surrounds the absorbent/adsorbent channel 16) from the cold/heat source inlet 14, and then enters the cold/heat source channel 23 with the microneedle rib plates 5 below the first partition 19 through the dispersion holes 4. The heat source transfers heat to the heat storage medium in the absorption/adsorption channel 16 through the heat transfer channel and the microneedle rib plate 5, water vapor in the liquid heat storage medium is separated after heat absorption, the liquid heat storage medium leaves the absorption/adsorption channel 16 through the porous hydrophobic membrane 20 and enters the condenser/evaporator 21, the water vapor exchanges heat with the heat exchange coil 15 in the condenser/evaporator 21 and is condensed in the refrigerant tray 13, and the water vapor flows into the liquid storage tank 1 through the refrigerant outlet 12 at the bottom of the refrigerant tray 13 under the action of gravity and pressure difference.
With the progress of the heat absorption process, the water vapor is continuously separated, so that the concentration of the liquid heat storage medium is increased until the liquid heat storage medium is concentrated into a saturated solution, then the crystalline hydrate is separated out from the saturated solution, the microneedle rib plate 5 array provides a crystalline core in the absorption/adsorption channel 16), the separated crystal is attached to the surface of the microneedle rib plate 5 until the heat absorption process is finished, and the control valve between the refrigerant outlet 12 and the liquid storage tank 1 is closed.
An exothermic process: opening a control valve between a refrigerant inlet 11 and the liquid storage tank 1, starting the liquid discharge pump 3, pumping the refrigerant into the condenser/evaporator 21, evaporating the refrigerant under the heat exchange action of the heat exchange coil 15 in the condenser/evaporator 21, allowing refrigerant steam to enter the absorption/adsorbent channel 16 through the porous hydrophobic membrane 20 under the action of pressure difference, and carrying out hydration reaction with the heat storage medium crystal on the surface of the microneedle ribbed plate 5 to form hydrated salt and release heat. Meanwhile, the cold source enters a heat transfer channel formed between the first partition 19 and the second partition 22 (i.e., a channel above the first partition 19 of the cold/heat source channel 23, which surrounds the absorbent/adsorbent channel 16, as indicated by arrows in fig. 2) from the cold/heat source inlet 14, and then enters the cold/heat source channel 23 with the microneedle ribs 5 below the first partition 19 through the dispersion holes 4, so as to take away heat generated by the absorbent/adsorbent channel 16. The hydrated salt absorbs more water vapor until a saturated salt solution is completely formed, which further absorbs water vapor to form a dilute solution of the heat storage medium. The heat taken away by the cold/heat source passage 23 is supplied to the user side.
According to the three-phase thermochemical heat storage device based on the porous hydrophobic membrane, the porous hydrophobic membrane 20 is arranged at the communication position of the condenser/evaporator 21 and the absorption/adsorption reactor 6, so that a liquid heat storage medium is effectively prevented from entering the condenser/evaporator 21, meanwhile, the absorption/adsorbent channel 16 formed between the micro-needle rib array plate assembly 18 and the porous hydrophobic membrane 20 in the absorption/adsorption reactor 6 greatly promotes nucleation and growth of crystals on the surface of the micro-needle rib plate 5, water evaporation on the surface of a liquid membrane is enhanced, the specific surface area of the crystals is increased, heat storage and heat release efficiency is improved, a circulation channel in the absorption/adsorption reactor 6 is prevented from being submerged when the crystals and water generate a thermochemical reaction release heat, meanwhile, a water vapor transmission channel constructed by utilizing a pore structure of the porous hydrophobic membrane 20 is utilized, the contact area of inorganic salt and water vapor is increased, the heat and mass transfer effects of the inorganic salt and the water vapor in the reactor are enhanced jointly by the factors, and the heat storage density and the heat storage reaction rate are favorably improved synergistically.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims (10)

1. A three-phase thermochemical heat storage device based on a porous hydrophobic membrane, comprising:
an absorption/adsorption reactor (6) comprising a first heat insulation shell (61), a micro-needle rib array plate assembly (18) and a porous hydrophobic membrane (20), wherein an absorption/adsorption channel (16) is formed between the micro-needle rib array plate assembly (18) and the porous hydrophobic membrane (20), and a heat storage medium is arranged in the absorption/adsorption channel (16); a cold/heat source channel (23) is formed between the microneedle rib array plate assembly (18) and the first insulating shell (61), and the cold/heat source channel (23) is communicated with a heat source through a cold/heat source outlet (7) and a cold/heat source inlet (14) or supplies heat to the outside;
a condenser/evaporator (21) disposed above the absorption/adsorption reactor (6), the porous hydrophobic membrane (20) separating the absorption/adsorbent channel (16) from the interior space of the condenser/evaporator (21);
the liquid storage tank (1) is connected with the condenser/evaporator (21) through a pump liquid pipeline and a liquid discharge pipeline;
in the heat absorption mode, a heat storage medium is decomposed to separate out gaseous refrigerant and solid crystals under the action of a heat source, the gaseous refrigerant enters a condenser/evaporator (21) through a porous hydrophobic membrane (20) to be condensed, the condensed refrigerant is stored in a liquid storage tank (1) through a liquid drainage pipeline, and the solid crystals are attached to the surface of a microneedle rib plate (5) on a microneedle rib array plate component (18); in the heat release mode, a refrigerant in the liquid storage tank (1) is pumped to the condenser/evaporator (21) through a pump liquid pipeline, the refrigerant is gasified under the action of evaporation heat, moves to the absorption/adsorbent channel (16) through the porous hydrophobic membrane (20), and is subjected to chemical reaction with solid crystals on the microneedle rib plate (5) to release heat, and heat is supplied to a user after heat exchange is carried out through the cold/heat source channel (23).
2. The porous hydrophobic membrane-based three-phase thermochemical heat storage apparatus of claim 1, wherein the micro-needle rib array plate assembly (18) further comprises a first spacer (19), micro-needle ribs (5) and a second spacer (22) are provided above the first spacer (19), the micro-needle ribs (5) are arranged in an array on the first spacer (19), the second spacer (22) is provided outside the micro-needle ribs (5), and the absorber/adsorbent channel (16) is formed between the porous hydrophobic membrane (20), the second spacer (22) and the first spacer (19).
3. Three-phase thermochemical heat storage device based on porous hydrophobic membrane according to claim 2, characterized in that the first partition (19) is arranged parallel to the porous hydrophobic membrane (20) and the microneedle ribs (5) are arranged perpendicular to the first partition (19).
4. The porous hydrophobic membrane-based three-phase thermochemical heat storage device according to claim 3, wherein the microneedle ribs (5) are arranged in a cross-sectional tapered shape from one end near the first partition (19) to one end near the porous hydrophobic membrane (20).
5. The porous hydrophobic membrane-based three-phase thermochemical heat storage apparatus according to any of claims 2 to 4, characterized in that the first partition (19) covers the entire inner cross section of the first insulating housing (61), and dispersion holes (4) are provided in the first partition (19), wherein the dispersion holes (4) and the cold heat source inlet (14) are provided at opposite ends of the cold/heat source channel (23), and the cold heat source inlet (14) and the cold heat source outlet (7) are provided at the same side of the cold/heat source channel (23).
6. The porous hydrophobic membrane-based three-phase thermochemical heat storage device according to claim 5, wherein a plurality of microneedle ribs (5) are provided below the first partition (19), and a plurality of microneedle ribs (5) are arranged in a uniform array on the lower surface of the first partition (19).
7. The porous hydrophobic membrane based three-phase thermochemical heat storage device according to claim 6, characterized in that the transverse cross-sectional area inside the absorption/adsorption reactor (6) is larger than the transverse cross-sectional area inside the condenser/evaporator (21), the first insulating housing (61) and the second insulating housing of the condenser/evaporator (21) are connected by flange seal fitting, and the length of the porous hydrophobic membrane (20) in the transverse direction is equal to the length of the condenser/evaporator (21) in the transverse direction.
8. The three-phase thermochemical heat storage device based on porous hydrophobic membrane according to claim 1 or 6, characterized in that inside the condenser/evaporator (21) is provided a refrigerant tray (13), on which refrigerant tray (13) is wound a heat exchange coil (15), the two ends of the pump liquid pipe are respectively a refrigerant outlet (12) and a liquid inlet (9), the refrigerant outlet (12) is provided on the bottom wall of the refrigerant tray (13), and the liquid inlet (9) is provided inside the liquid storage tank (1); the liquid discharging device is characterized in that a liquid discharging port (2) and a refrigerant inlet (11) are respectively formed in two ends of the liquid discharging pipeline, the liquid discharging port (2) is arranged inside the liquid storage tank (1), and the refrigerant inlet (11) is arranged inside the condenser/evaporator (21).
9. The three-phase thermochemical heat storage device based on porous hydrophobic membrane according to claim 8, wherein the liquid inlet (9) is arranged at the upper end of the liquid storage tank (1), the liquid outlet (2) is arranged at the lower end of the liquid storage tank (1), the refrigerant inlet (11) is arranged above the refrigerant tray (13), a channel for the circulation of refrigerant vapor is arranged at the center of the refrigerant tray (13), the top of the refrigerant tray (13) is arranged in an open manner, the pump liquid pipeline and the liquid discharge pipeline are cut off by a control valve to control the on-off state of the pipelines, and the liquid discharge pump (3) is arranged on the liquid discharge pipeline.
10. Three-phase thermochemical heat storage device based on porous hydrophobic membrane according to claim 9, characterized in that an access opening (10) is provided on the liquid drain, the liquid inlet (9) being provided between the access opening (10) and the refrigerant outlet (12).
CN202211216047.2A 2022-09-30 2022-09-30 Three-phase thermochemical heat storage device based on porous hydrophobic membrane Pending CN115597417A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211216047.2A CN115597417A (en) 2022-09-30 2022-09-30 Three-phase thermochemical heat storage device based on porous hydrophobic membrane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211216047.2A CN115597417A (en) 2022-09-30 2022-09-30 Three-phase thermochemical heat storage device based on porous hydrophobic membrane

Publications (1)

Publication Number Publication Date
CN115597417A true CN115597417A (en) 2023-01-13

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Country Link
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