A three-phase thermochemical heat storage device based on porous hydrophobic membranes

Abstract

The application provides a kind of three-phase thermochemical heat storage device based on porous hydrophobic membrane, comprising: absorption / adsorption reactor, including first adiabatic shell, micro-needle rib array plate assembly and porous hydrophobic membrane, absorption / adsorbent passage is formed between micro-needle rib array plate assembly and porous hydrophobic membrane, and heat storage medium is arranged in absorption / adsorbent passage;Condenser / evaporator is arranged above absorption / adsorption reactor, and the porous hydrophobic membrane separates absorption / adsorbent passage from condenser / evaporator internal space;Liquid storage tank is connected with condenser / evaporator by pump liquid pipeline and liquid discharge pipeline.The three-phase thermochemical heat storage device based on porous hydrophobic membrane provided by the application utilizes micro-needle rib array plate assembly and porous hydrophobic membrane to realize three-phase chemical heat storage, improve heat storage density and heat storage and release reaction rate, and at the same time, avoid liquid heat storage medium into condenser / evaporator, facilitate control, heat absorption, heat release and stable operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the application technical field of heat and mass transfer enhancement and phase change thermal storage system, and particularly relates to a three-phase thermochemical heat storage device based on porous hydrophobic membrane. BACKGROUND

[0002] In order to realize the comprehensive utilization of renewable energy and industrial waste heat resources, implementing efficient energy storage technology is a necessary means to solve the problems of instantaneity and instability of renewable energy and waste heat resources, and the mismatch between energy supply and demand. Thermal energy and cold energy account for about half of the total energy consumption in global user terminal demand, so thermal storage technology has attracted widespread attention.

[0003] Thermal storage technology includes three main storage methods: sensible heat, latent heat and thermochemical heat storage. Compared with the first two, thermochemical heat storage has the characteristics of high heat storage density and small heat loss in long-period storage, and is considered to be a long-period cross-seasonal heat storage technology with great application prospect. Among them, thermochemical absorption / adsorption heat storage has the characteristics of environmental friendliness and low regeneration temperature, and can realize the regulation of heat energy quality of heat storage and release process by changing the pressure parameter, meet the storage and supply demand of different grade heat energy / cold energy, especially suitable for-20-250℃ medium and low temperature heat energy / cold energy storage, building or industrial heat / cold supply demand, and has high energy comprehensive utilization efficiency.

[0004] Through literature retrieval of the prior art, a thermochemical heat storage device is disclosed in Chinese patent with patent application number CN 101855508 A. The water flow path on the lower side of the heat exchanger is connected with the dispersion plate, and the water supplied to the container is uniformly supplied to the heat storage material upward, so as to realize the uniform mixing of the heat storage material and the water and the heat dissipation process. This design can prevent the heat storage material from entering the inside of the water flow path. The device uses three-phase thermochemical heat storage, but the heat dissipation process uses two-phase, which is not conducive to the improvement of mass transfer rate and heat release rate.

[0005] Chinese patents with patent application numbers CN 103256729 A and CN 108548443 A disclose two kinds of thermochemical heat storage devices. The two patents realize the separation and combination of refrigerant vapor and heat storage material through the connection of the reactor and the evaporator / condenser and the refrigerant storage tank. However, the device can only realize two-phase thermochemical heat storage, which limits the improvement of heat storage density. At the same time, once the heat storage material is liquefied in the heat dissipation process, the heat storage material in patent CN 103256729 A will enter the refrigerant storage tank through the valve, or the gaseous refrigerant channel in CN 108548443 A will be flooded, increasing the control difficulty and testing the stability of the device. SUMMARY

[0006] Therefore, the present application aims to overcome the deficiencies of the prior art, and provide a three-phase thermochemical heat storage device based on porous hydrophobic membrane, which can improve the heat and mass transfer efficiency of the heat storage device, thereby improving the heat storage and release rate, increasing the heat storage density and ensuring the stable operation of the heat storage device.

[0007] To achieve the above-mentioned purposes, the technical scheme of the present application is as follows:

[0008] A three-phase thermochemical heat storage device based on porous hydrophobic membrane, comprising:

[0009] An absorption / adsorption reactor, comprising a first adiabatic shell, a micro-needle rib array plate assembly and a porous hydrophobic membrane, an absorption / adsorption agent channel is formed between the micro-needle rib array plate assembly and the porous hydrophobic membrane, and a heat storage medium is arranged in the absorption / adsorption agent channel; a cold / hot source channel is formed between the micro-needle rib array plate assembly and the first adiabatic shell, and the cold / hot source channel is communicated with a heat source or supplies heat to the outside through a cold / hot source outlet and a cold / hot source inlet;

[0010] A condenser / evaporator is arranged above the absorption / adsorption reactor, and the porous hydrophobic membrane separates the absorption / adsorption agent channel from the internal space of the condenser / evaporator;

[0011] A liquid storage tank is connected with the condenser / evaporator through a pump liquid pipeline and a liquid discharge pipeline;

[0012] In the heat absorption mode, the heat storage medium is resolved into gaseous refrigerant and solid crystal under the action of the heat source, the gaseous refrigerant enters the condenser / evaporator through the porous hydrophobic membrane and is condensed, the condensed refrigerant is stored in the liquid storage tank through the liquid discharge pipeline, and the solid crystal adheres to the surface of the micro-needle rib plate of the micro-needle rib array plate assembly; in the heat release mode, the refrigerant in the liquid storage tank is pumped to the condenser / evaporator through the pump liquid pipeline, the refrigerant is vaporized under the evaporation heat and moves to the absorption / adsorption agent channel through the porous hydrophobic membrane, and then reacts with the solid crystal on the micro-needle rib plate to release heat, and finally supplies heat to the user after heat exchange through the cold / hot source channel.

[0013] Further, the micro-needle rib array plate assembly further comprises a first partition plate, a micro-needle rib plate and a second partition plate are arranged above the first partition plate, the micro-needle rib plate is arranged in an array shape on the first partition plate, the second partition plate is arranged on the outer side of the micro-needle rib plate, and the absorption / adsorption agent channel is formed between the porous hydrophobic membrane, the second partition plate and the first partition plate.

[0014] Further, the first partition plate is arranged in parallel with the porous hydrophobic membrane, and the micro-needle rib plate is arranged vertically with the first partition plate.

[0015] Further, the micro-needle rib plate is arranged in a tapered shape from one end close to the first partition plate to the other end close to the porous hydrophobic membrane.

[0016] Further, the first partition plate covers the entire inner cross section of the first adiabatic shell, and the first partition plate is provided with dispersion holes, wherein the dispersion holes and the cold heat source inlet are arranged at opposite ends of the cold heat source channel, and the cold heat source inlet and the cold heat source outlet are arranged at the same side of the cold heat source channel.

[0017] Further, a plurality of micro-needle rib plates are arranged below the first partition plate, and the plurality of micro-needle rib plates are arranged in a uniform array on the lower surface of the first partition plate.

[0018] Further, the transverse cross-sectional area inside the absorption / adsorption reactor is greater than the transverse cross-sectional area inside the condenser / evaporator, the first adiabatic shell and the second insulation shell of the condenser / evaporator are connected by flange sealing assembly, 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.

[0019] Further, the condenser / evaporator is provided with a refrigerant tray, and a heat exchange coil is wound on the refrigerant tray, both ends of the pump liquid pipeline are a refrigerant outlet and a liquid inlet, the refrigerant outlet is arranged on the bottom wall of the refrigerant tray, and the liquid inlet is arranged inside the liquid storage tank; both ends of the liquid discharge pipeline are a liquid discharge port and a refrigerant inlet, the liquid discharge port is arranged inside the liquid storage tank, and the refrigerant inlet is arranged inside the condenser / evaporator.

[0020] Further, the liquid inlet is arranged at the upper end of the liquid storage tank, the liquid discharge port is arranged at the lower end of the liquid storage tank, the refrigerant inlet is arranged above the refrigerant tray, the center of the refrigerant tray has a channel for refrigerant vapor flow, the top of the refrigerant tray is arranged in an open shape, the pump liquid pipeline and the liquid discharge pipeline are connected through a control valve to cut off the pipeline, and a liquid discharge pump is arranged on the liquid discharge pipeline.

[0021] Further, an access opening is arranged on the liquid discharge pipeline, and the liquid inlet is arranged between the access opening and the refrigerant outlet.

[0022] Compared with the prior art, the three-phase thermo-chemical heat storage device based on the porous hydrophobic membrane has the following advantages:

[0023] (1) The three-phase thermo-chemical heat storage device based on porous hydrophobic membrane, using the micro-needle rib array plate assembly and the porous hydrophobic membrane, realizes three-phase chemical heat storage, improves the heat storage density and the heat storage and release reaction rate, and avoids the liquid heat storage medium from entering the condenser / evaporator, prevents the absorption / adsorption agent channel from being blocked in the heat absorption state or being flooded in the heat release state, facilitates control, and stabilizes the heat absorption and release work.

[0024] (2) The three-phase thermo-chemical heat storage device based on the porous hydrophobic membrane, the micro-needle rib plate arranged in the cold / hot source channel is beneficial to reducing the included angle between the cold / hot source flow velocity direction and the temperature gradient, and further strengthening the efficiency of convective heat transfer; the micro-needle rib plate array arranged in the absorption / adsorption agent channel is beneficial to forming a uniformly distributed thin liquid film, and the vertical heat transfer strengthening is beneficial to increasing the vaporization core and promoting the evaporation of water on the liquid film surface.

[0025] (3) The three-phase thermo-chemical heat storage device based on the porous hydrophobic membrane, the micro-needle rib plate array in the absorption / adsorption agent channel can provide a crystallization core, promote the nucleation and growth of crystals on the surface of the micro-needle rib plate, avoid the deposition of crystals on the surface of the porous membrane and the liquid film surface, which is beneficial to strengthening the evaporation of water on the liquid film surface and increasing the specific surface area of the crystals and improving the heat release reaction rate.

[0026] (4) The three-phase thermo-chemical heat storage device based on the porous hydrophobic membrane, using the pore structure of the porous hydrophobic membrane to construct a water vapor transmission channel, increases the contact area between the absorption / adsorption agent channel and the water vapor, and the above factors jointly strengthen the heat and mass transfer between the inorganic salt and the water vapor in the absorption / adsorption reactor, which is beneficial to synergistically improving the heat storage density and the heat storage and release reaction rate. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and the schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0028] Figure 1 The three-phase thermo-chemical heat storage device described in the embodiments of the present application is shown in the schematic diagram;

[0029] Figure 2 The top view structural schematic diagram of the absorption / adsorption reactor described in the embodiments of the present application is shown in the schematic diagram;

[0030] Figure 3 The side view structural schematic diagram of the absorption / adsorption reactor described in the embodiments of the present application is shown in the schematic diagram;

[0031] Figure 4 The principle schematic diagram of the water vapor transmission channel constructed by the water vapor passing through the pores of the porous hydrophobic membrane is shown in the schematic diagram;

[0032] Reference Signs List:

[0033] 1 - reservoir; 2 - drain; 3 - drain pump; 4 - dispersion hole; 5 - microneedle rib; 6 - absorption / adsorption reactor; 61 - first adiabatic shell; 7 - cold heat source outlet; 8 - control valve; 9 - liquid inlet; 10 - maintenance opening; 11 - refrigerant inlet; 12 - refrigerant outlet; 13 - refrigerant tray; 14 - cold heat source inlet; 15 - heat exchange coil; 16 - absorption / adsorbent passage; 18 - microneedle rib array plate assembly; 19 - first partition; 20 - porous hydrophobic membrane; 21 - condenser / evaporator; 211 - second adiabatic shell; 22 - second partition; 23 - cold heat source passage; 24 - water vapor. DETAILED DESCRIPTION

[0034] In order to make the technical means and purposes of the present application easy to understand, the embodiments of the present application are described in detail below in combination with specific drawings.

[0035] It should be noted that all directional and positional terms used in the present application, such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inner", "outer", "top", "bottom", "lateral", "longitudinal", "center", etc., are used only for the purpose of explanation and description and are not required to be construed as indicating or implying that the present application must be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the description of "first", "second", etc. in the present application is only for the purpose of description and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features.

[0036] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixed connection, can be detachable connection, or integrally connected; can be mechanical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0038] As shown in Figures 1 to 4 The present application discloses a kind of porous hydrophobic membrane-based three-phase thermochemical heat storage device, comprising:

[0039] absorption / adsorption reactor 6, including first adiabatic shell 61, microneedle rib array plate assembly 18 and porous hydrophobic membrane 20, absorption / adsorption agent passage 16 is formed between the microneedle rib array plate assembly 18 and porous hydrophobic membrane 20, and heat storage medium is arranged in the absorption / adsorption agent passage 16;Cold / heat source passage 23 is formed between the microneedle rib array plate assembly 18 and first adiabatic shell 61, and the cold / heat source passage 23 is communicated with heat source or supplies heat to outside through cold heat source outlet 7, cold heat source inlet 14;

[0040] condenser / evaporator 21 is arranged above the absorption / adsorption reactor 6, and the porous hydrophobic membrane 20 separates the absorption / adsorption agent passage 16 from the internal space of condenser / evaporator 21;

[0041] liquid storage tank 1 is connected with the condenser / evaporator 21 through pump liquid pipeline and liquid discharge pipeline;

[0042] In heat absorption mode, heat storage medium is resolved into gaseous refrigerant and solid crystal under the action of heat source, the gaseous refrigerant enters condenser / evaporator 21 through porous hydrophobic membrane 20 and is condensed, and the condensed refrigerant is stored in liquid storage tank 1 through liquid discharge pipeline, and the solid crystal adheres to the surface of microneedle rib plate 5 of microneedle rib array plate assembly 18;In heat release mode, refrigerant in liquid storage tank 1 is pumped to condenser / evaporator 21 through pump liquid pipeline, and the refrigerant is vaporized under the action of evaporation heat, moves to absorption / adsorption agent passage 16 through porous hydrophobic membrane 20, and chemically reacts with solid crystal on microneedle rib plate 5 to release heat, and supplies heat to user after heat exchange through cold / heat source passage 23.

[0043] The three-phase thermo-chemical heat storage device based on the porous hydrophobic membrane has the following advantages: the heat storage medium arranged in the absorption / adsorption reactor 6 is in a liquid state in the initial heat absorption state, the liquid heat storage medium is limited in the absorption / adsorption channel 16 between the microneedle rib array plate assembly 18 and the porous hydrophobic membrane 20, when the heat absorption starts, the heat source supplies heat to the cold / heat source channel 23 through the cold / heat source inlet 14, the gaseous refrigerant (for example, water vapor) and the solid crystal (for example, inorganic salt particles) are separated out from the liquid heat storage medium in the absorption / adsorption channel 16, wherein, due to the effect of the porous hydrophobic membrane 20, the liquid heat storage medium is limited in the absorption / adsorption channel 16, the gaseous refrigerant passes through the porous hydrophobic membrane 20 and enters the condenser / evaporator 21 to be condensed, and due to the effect of the microneedle rib plate 5 of the microneedle rib array plate assembly 18, the solid crystal separated out from the liquid heat storage medium adheres to the microneedle rib plate 5, thereby avoiding the absorption / adsorption channel 16 from being blocked in the heat absorption state and from being flooded in the heat release state; the refrigerant condensed in the condenser / evaporator 21 is stored in the liquid storage tank 1 through the liquid discharge pipeline, and after the heat absorption process ends, the 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 evaporates and gasifies to react with the solid crystal on the microneedle rib plate 5 (for example, water chemical reaction), and heat is released, at this time, the cold / heat source outlet 7 and the cold / heat source inlet 14 of the cold / heat source channel 23 are connected to the medium to be heated of the user through the control valve 8, thereby realizing heat supply for the user.

[0044] The three-phase thermo-chemical heat storage device based on the porous hydrophobic membrane has the following advantages: the heat storage medium arranged in the absorption / adsorption reactor 6 is in a liquid state in the initial heat absorption state, the liquid heat storage medium is limited in the absorption / adsorption channel 16 between the microneedle rib array plate assembly 18 and the porous hydrophobic membrane 20, when the heat absorption starts, the heat source supplies heat to the cold / heat source channel 23 through the cold / heat source inlet 14, the gaseous refrigerant (for example, water vapor) and the solid crystal (for example, inorganic salt particles) are separated out from the liquid heat storage medium in the absorption / adsorption channel 16, wherein, due to the effect of the porous hydrophobic membrane 20, the liquid heat storage medium is limited in the absorption / adsorption channel 16, the gaseous refrigerant passes through the porous hydrophobic membrane 20 and enters the condenser / evaporator 21 to be condensed, and due to the effect of the microneedle rib plate 5 of the microneedle rib array plate assembly 18, the solid crystal separated out from the liquid heat storage medium adheres to the microneedle rib plate 5, thereby avoiding the absorption / adsorption channel 16 from being blocked in the heat absorption state and from being flooded in the heat release state; the refrigerant condensed in the condenser / evaporator 21 is stored in the liquid storage tank 1 through the liquid discharge pipeline, and after the heat absorption process ends, the 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 evaporates and gasifies to react with the solid crystal on the microneedle rib plate 5 (for example, water chemical reaction), and heat is released, at this time, the cold / heat source outlet 7 and the cold / heat source inlet 14 of the cold / heat source channel 23 are connected to the medium to be heated of the user through the control valve 8, thereby realizing heat supply for the user.

[0045] As a preferred example of the present application, the microneedle rib array plate assembly 18 further comprises a first partition plate 19, the microneedle rib plate 5 and a second partition plate 22 are arranged above the first partition plate 19, the microneedle rib plate 5 is arranged in an array on the first partition plate 19, the second partition plate 22 is arranged outside the microneedle rib plate 5, and the absorption / adsorption channel 16 is formed between the porous hydrophobic membrane 20, the second partition plate 22 and the first partition plate 19. As an example of the present application, the first partition plate 19 is a metal partition plate.

[0046] The setting discloses a formation structure of the absorption / adsorption agent channel 16, which is beneficial to form a uniformly distributed thin liquid film through the microneedle rib plate 5 array arranged in the absorption / adsorption agent channel 16, beneficial to improve the heat storage rate and heat storage density, and meanwhile, since the microneedle rib plate 5 array can provide a crystallization core in the inorganic salt channel, the nucleation and growth of the crystal on the surface of the microneedle rib plate 5 are promoted, the crystal deposition on the surface of the porous hydrophobic membrane 20 and the liquid film surface is avoided, which is beneficial to strengthen the water evaporation on the liquid film surface and increase the specific surface area of the crystal, and further improve the heat release reaction rate.

[0047] As preferred, the first partition plate 19 is arranged in parallel with the porous hydrophobic membrane 20, and the microneedle rib plate 5 is arranged perpendicularly to the first partition plate 19.

[0048] The setting is beneficial to increase the vaporization core and promote the water evaporation on the liquid film surface through the strengthening of the heat transfer in the vertical direction, and further improve the heat storage rate.

[0049] As preferred, the microneedle rib plate 5 is arranged in a tapered shape from one end close to the first partition plate 19 to the other end close to the porous hydrophobic membrane 20.

[0050] The setting further improves the efficiency of the adsorption and growth or chemical reaction of the crystal on the microneedle rib plate 5, and improves the heat absorption / release reaction rate.

[0051] As a preferred example of the present application, the first partition plate 19 covers the entire inner section of the first heat insulation shell 61, and the dispersion hole 4 is arranged on the first partition plate 19, wherein the dispersion hole 4 and the cold and hot source inlet 14 are arranged at opposite ends of the cold / hot source channel 23, and the cold and hot source inlet 14 and the cold and hot source outlet 7 are arranged on the same side of the cold / hot source channel 23.

[0052] The setting makes the heat source or cold source pass through the heat transfer channel formed between the first partition plate 19 and the second partition plate 22 around the outside of the absorption / adsorption agent channel 16 after entering the cold / hot source channel 23 through the cold and hot source inlet 14, then enters the inside of the cold / hot source channel 23 below the first partition plate 19 through the dispersion hole 4, and finally is discharged through the cold and hot source outlet 7. The setting further improves the efficiency of the heat absorption or release of the absorption / adsorption reactor 6 by limiting the flow channel inside the cold / hot source channel 23.

[0053] As a preferred example of the present application, a plurality of microneedle rib plates 5 are arranged below the first partition plate 19, and the plurality of microneedle rib plates 5 are arranged in a uniform array on the lower surface of the first partition plate 19. As preferred, the microneedle rib plates 5 on the upper surface of the first partition plate 19 are arranged in a symmetrical manner with the microneedle rib plates 5 on the lower surface of the first partition plate 19.

[0054] The array of micro-needle riblets 5 arranged in the cold / hot source channel 23 is conducive to reducing the angle between the flow direction of the cold / hot source and the temperature gradient, further enhancing the efficiency of convective heat transfer, and ensuring the reliability of heat absorption and heat release.

[0055] As a preferred example of the present application, the transverse cross-sectional area inside the absorption / adsorption reactor 6 is greater than the transverse cross-sectional area inside the condenser / evaporator 21, the first adiabatic shell 61 is sealingly connected to the second adiabatic shell 211 of the condenser / evaporator 21 through a flange, 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. As a preferred example, the porous hydrophobic membrane 20 can be provided with multiple layers.

[0056] The three-phase thermo-chemical heat storage device based on the porous hydrophobic membrane according to the present application, by arranging the porous hydrophobic membrane 20 at the connection between the absorption / adsorption reactor 6 and the condenser / evaporator 21, utilizes the water vapor transport channels constructed by the pore structure of the porous membrane, while avoiding the passage of liquid heat storage medium, increasing the contact area between the inorganic salt and water vapor, and ensuring the reliability of heat absorption and heat release of the three-phase thermo-chemical heat storage device.

[0057] Specifically, as shown in Figure 4 The upper and lower surfaces of the first partition plate 19 are provided with an array of micro-needle riblets 5, and the space between the first partition plate 19 and the porous hydrophobic membrane 20 is used to store heat storage medium. The multiple micro-needle riblets 5 form the crystallization core of inorganic salt crystals precipitated during heat absorption of the heat storage medium, and the absorption / adsorption agent channel 16 for flowing water vapor is formed between the multiple micro-needle riblets 5. The heat storage medium forms a water vapor liquid film along the micro-needle riblets 5 in the heat absorption state, and the water vapor 24 finally flows to the condenser / evaporator 21 through the water vapor transport channels constructed by the pore structure of the porous hydrophobic membrane 20, while the liquid heat storage medium is still isolated in the absorption / adsorption agent channel 16, thereby realizing the heat absorption function of the three-phase thermo-chemical heat storage device. The heat release function of the three-phase thermo-chemical heat storage device is similar to the previous scheme, and is not repeated here.

[0058] As a preferred example of the present application, the condenser / evaporator 21 is internally provided with a refrigerant tray 13, on which a heat exchange coil 15 is wound, both ends of the pump liquid pipe are respectively a refrigerant outlet 12 and a liquid inlet 9, the refrigerant outlet 12 is arranged on the bottom wall of the refrigerant tray 13, and the liquid inlet 9 is arranged inside the liquid storage tank 1; both ends of the liquid outlet pipe are respectively a liquid outlet 2 and a refrigerant inlet 11, the liquid outlet 2 is arranged inside the liquid storage tank 1, and the refrigerant inlet 11 is arranged inside the condenser / evaporator 21. As a preferred example, 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 pipe and the liquid outlet pipe are connected through a control valve to cut off the on-off state of the pipe, and a liquid outlet pump 3 is arranged on the liquid outlet pipe. As an example of the present application, the center of the refrigerant tray 13 has a passage for the flow of refrigerant vapor, and the top of the refrigerant tray 13 is arranged in an open manner.

[0059] As a preferred example of the present application, a maintenance opening 10 is arranged on the liquid outlet pipe, and the liquid inlet 9 is arranged between the maintenance opening 10 and the refrigerant outlet 12. An on-off valve is arranged between the maintenance opening 10 and the liquid inlet 9, and the maintenance opening 10 can be used for vacuumizing.

[0060] As a preferred example of the present application, an auxiliary electric heating device is arranged on the liquid storage tank 1.

[0061] The three-phase thermochemical heat storage device based on porous hydrophobic membrane according to the present application is used to realize a controllable step phase change heat storage device control method, which comprises the following steps:

[0062] Before using the three-phase thermochemical heat storage device based on porous hydrophobic membrane according to the present application, the maintenance opening 10 of the device is connected to a vacuum pump to vacuumize, and an appropriate amount of refrigerant is added to the liquid storage tank 1, and after the addition is completed, the maintenance opening 10 is closed.

[0063] Heat absorption process: At the beginning of the heat absorption process, the heat storage medium in the absorber / adsorbent channel 16 is liquid. The heat source enters the heat transfer channel formed between the first partition 19 and the second partition 22 (i.e., the channel above the first partition 19 in the cold / heat source channel 23, which surrounds the absorber / adsorbent channel 16) through the cold / heat source inlet 14, and then enters the cold / heat source channel 23 with micro-needle ribs 5 below the first partition 19 through the dispersion holes 4. The heat source transfers heat to the heat storage medium in the absorber / adsorbent channel 16 through the heat transfer channel and the micro-needle ribs 5. After heat absorption, the water vapor in the liquid heat storage medium separates and leaves the absorber / adsorbent 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 condenses in the refrigerant tray 13, and 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.

[0064] As the heat absorption process proceeds, water vapor is continuously separated, which increases the concentration of the liquid heat storage medium until it is concentrated into a saturated solution. Then, crystalline hydrates precipitate from the saturated solution. The microneedle rib array 5 provides crystallization nuclei in the absorber / adsorbent channel 16). The precipitated crystals adhere to the surface of the microneedle rib 5 until the heat absorption process ends and the control valve between the refrigerant outlet 12 and the liquid storage tank 1 is closed.

[0065] Heat release process: Open the control valve between the refrigerant inlet 11 and the liquid storage tank 1, and start the drain pump 3 to pump the refrigerant into the condenser / evaporator 21. Under the heat exchange action of the heat exchange coil 15 in the condenser / evaporator 21, the refrigerant evaporates. Under the action of pressure difference, the refrigerant vapor enters the absorber / adsorbent channel 16 through the porous hydrophobic membrane 20, and undergoes a hydration reaction with the heat storage medium crystallization on the surface of the microneedle fin 5 to form hydrated salts and release heat. At the same time, the cold source enters the heat transfer channel formed between the first partition 19 and the second partition 22 (i.e., the cold / heat source channel 23 above the first partition 19, which surrounds the absorber / adsorbent channel 16) from the cold / heat source inlet 14. Figure 2 (As indicated by the middle arrow), the heat then enters the cold / heat source channel 23 with microneedle ribs 5 below the first partition 19 through the dispersion holes 4, carrying away the heat generated by the absorbent / adsorbent channel 16. The hydrated salt absorbs more water vapor until a saturated salt solution is completely formed. The saturated solution further absorbs water vapor, forming a dilute solution of the heat storage medium. The heat carried away by the cold / heat source channel 23 is supplied to the user side.

[0066] The three-phase thermo-chemical heat storage device based on porous hydrophobic membrane provided with the porous hydrophobic membrane 20 at the communication between the condenser / evaporator 21 and the absorption / adsorption reactor 6, effectively avoids the liquid heat storage medium from entering the condenser / evaporator 21, and the absorption / adsorbent channel 16 formed between the micro-needle rib array plate assembly 18 inside the absorption / adsorption reactor 6 and the porous hydrophobic membrane 20 greatly promotes the nucleation and growth of the crystal on the surface of the micro-needle rib plate 5, strengthens the evaporation of the water in the liquid film surface, increases the specific surface area of the crystal, improves the heat storage and heat release efficiency, avoids the flooding of the flow-through channel in the absorption / adsorption reactor 6 when the crystal and water release heat through the hydro-chemical reaction, and simultaneously uses the water vapor transmission channel constructed by the pore structure of the porous hydrophobic membrane 20 to increase the contact area of the inorganic salt and the water vapor, the above factors jointly strengthen the heat and mass transfer of the inorganic salt and the water vapor in the reactor, which is beneficial to the synergistic improvement of the heat storage density and the heat storage and release reaction rate.

[0067] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-phase thermo-chemical heat storage device based on porous hydrophobic membranes, characterized in that, The application relates to a heat storage and release device, which comprises the following parts: an absorption / adsorption reactor (6) comprising a first adiabatic shell (61), a micro-needle rib array plate assembly (18) and a porous hydrophobic membrane (20), an absorption / adsorption agent channel (16) being formed between the micro-needle rib array plate assembly (18) and the porous hydrophobic membrane (20), a heat storage medium being arranged in the absorption / adsorption agent channel (16); a cold / heat source channel (23) being formed between the micro-needle rib array plate assembly (18) and the first adiabatic shell (61), the cold / heat source channel (23) being communicated with a heat source or supplying heat to the outside through a cold / heat source outlet (7) and a cold / heat source inlet (14); a condenser / evaporator (21) being arranged above the absorption / adsorption reactor (6), the porous hydrophobic membrane (20) separating the absorption / adsorption agent channel (16) from the inside space of the condenser / evaporator (21); a liquid storage tank (1) being connected with the condenser / evaporator (21) through a pump liquid pipeline and a liquid discharge pipeline; wherein, in the heat absorption mode, the heat storage medium is resolved into gaseous refrigerant and solid crystal under the action of the heat source, the gaseous refrigerant enters the condenser / evaporator (21) through the porous hydrophobic membrane (20) and is condensed, the condensed refrigerant is stored into the liquid storage tank (1) through the liquid discharge pipeline, and the solid crystal adheres to the surface of the micro-needle rib plate (5) of the micro-needle 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 the pump liquid pipeline, the refrigerant is gasified under the evaporation heat and moves to the absorption / adsorption agent channel (16) through the porous hydrophobic membrane (20), and the solid crystal on the micro-needle rib plate (5) is chemically reacted to release heat, and the heat is supplied to the user after heat exchange through the cold / heat source channel (23).

2. The porous hydrophobic membrane-based tri-thermal chemical heat storage device of claim 1, wherein, The micro-needle rib array plate assembly (18) further comprises a first partition plate (19), a micro-needle rib plate (5) and a second partition plate (22) being arranged above the first partition plate (19), the micro-needle rib plate (5) being arranged in an array on the first partition plate (19), and the second partition plate (22) being arranged outside the micro-needle rib plate (5), the absorption / adsorption agent channel (16) being formed between the porous hydrophobic membrane (20), the second partition plate (22) and the first partition plate (19).

3. The porous hydrophobic membrane-based tri-thermal thermo-chemical storage device of claim 2, wherein, The first partition plate (19) is arranged in parallel with the porous hydrophobic membrane (20), and the micro-needle rib plate (5) is arranged in perpendicular with the first partition plate (19).

4. The porous hydrophobic membrane-based tri-thermal thermo-chemical storage device of claim 3, wherein, The micro-needle rib plate (5) is arranged in a gradually tapered shape from one end close to the first partition plate (19) to the other end close to the porous hydrophobic membrane (20).

5. The multi-phase thermo-chemical heat storage device based on porous hydrophobic membranes according to any one of claims 2 to 4, characterized in that The first partition plate (19) covers the whole inner section of the first adiabatic shell (61), and dispersion holes (4) are arranged on the first partition plate (19), wherein the dispersion holes (4) and the cold / heat source inlet (14) are arranged 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 arranged at the same side of the cold / heat source channel (23).

6. The porous hydrophobic membrane-based tri-thermal thermo-chemical storage device of claim 5, wherein, A plurality of micro-needle ribs (5) are arranged below the first partition plate (19) and are arranged in a uniform array on the lower surface of the first partition plate (19).

7. The porous hydrophobic membrane-based tri-thermal thermo-chemical storage device of claim 6, wherein, The lateral cross-sectional area inside the absorption / adsorption reactor (6) is greater than the lateral cross-sectional area inside the condenser / evaporator (21), the first heat-insulating shell (61) and the second heat-insulating shell of the condenser / evaporator (21) are connected by flange sealing assembly, and the length of the porous hydrophobic membrane (20) in the lateral direction is equal to the length of the condenser / evaporator (21) in the lateral direction.

8. The porous hydrophobic membrane-based tri-thermal thermo-chemical storage device of claim 1 or 6, wherein, The condenser / evaporator (21) is provided with a refrigerant tray (13), a heat exchange coil (15) is wound on the refrigerant tray (13), both ends of the pump liquid pipeline are respectively a refrigerant outlet (12) and a liquid inlet (9), the refrigerant outlet (12) is arranged on the bottom wall of the refrigerant tray (13), and the liquid inlet (9) is arranged inside the liquid storage tank (1); both ends of the liquid discharge pipeline are respectively 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).

9. The porous hydrophobic membrane-based tri-thermal thermo-chemical storage device of claim 8, wherein, The liquid inlet (9) is arranged at the upper end of the liquid storage tank (1), the liquid discharge port (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 center of the refrigerant tray (13) has a passage for refrigerant vapor flow, the top of the refrigerant tray (13) is arranged in an open manner, the pump liquid pipeline and the liquid discharge pipeline are connected through a control valve to cut off the on-off state of the pipeline, and a liquid discharge pump (3) is arranged on the liquid discharge pipeline.

10. The porous hydrophobic membrane-based tri-thermal thermo-chemical storage device of claim 9, wherein, An access hole (10) is arranged on the liquid discharge pipeline, and the liquid inlet (9) is arranged between the access hole (10) and the refrigerant outlet (12). An access hole (10) is arranged on the liquid discharge pipeline, and the liquid inlet (9) is arranged between the access hole (10) and the refrigerant outlet (12).

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