CN114322624B - Energy storage-release device for sectional type electric drive current coupling electric heating - Google Patents
Energy storage-release device for sectional type electric drive current coupling electric heating Download PDFInfo
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Abstract
The invention provides a sectional type electric drive current coupling electric heating energy storage-release device, and belongs to the field of high-efficiency energy storage-release of thermoelectric conversion. The problems of long charging and discharging cycle caused by low heat conductivity coefficient of a phase-change material, high shutdown maintenance cost caused by integration of the device and low energy storage-release efficiency in the current energy storage-release process are solved, the sectional type electric drive current coupling electric heating energy storage-release device with high efficiency peak regulation and frequency modulation is provided, and drive electrodes are arranged on the upper side and the lower side of a partition plate between the sectional type electric drive current coupling electric heating energy storage-release device; the energy storage units are arranged in series and are wrapped in the packaging tank body, a plurality of fluid inlet guide pipes are arranged at the uppermost end of the partition plate, a plurality of fluid outlet guide pipes are arranged at the lowermost end of the partition plate, and the heat insulation tank body is arranged at the outermost layer of the device. The invention adopts a multi-way enhanced thermal disturbance mode of electrofluid driving and external heat source heating, and efficiently and quickly stores the electricity/heat energy which cannot be directly stored, thereby further improving the comprehensive utilization rate of energy.
Description
Technical Field
The invention belongs to the technical field of high-efficiency energy storage-release of thermoelectric conversion, and particularly relates to a sectional type electric drive current coupling electric heating energy storage-release device.
Background
At present, the energy consumption of China still takes the traditional fossil energy as the main energy, and the nation proposes the transformation of energy production and consumption structure from the strategic level of sustainable development based on the situation of China, so that the storage of energy becomes one of the key points of the transformation of the energy structure of China at present.
In recent years, the energy storage of China presents a good situation of multivariate development. In the energy recovery in the fields of solar photo-thermal, industrial waste heat, power grid peak regulation and the like, because the energy has intermittency and instability, the contradiction that the energy recovery and utilization are not matched in time, space and intensity is caused. Among the energy storage technologies, the phase change energy storage technology is attracting attention because of its advantages of high energy storage density, simple system, small temperature fluctuation range in the heat absorbing and releasing process, etc. Compared with gas-liquid phase change, the solid-liquid phase change energy storage technology has the advantages of high energy storage efficiency, small volume change in the phase change process, stable and simple system, high economy and the like, solves the problem of energy storage of unmatched time-space-strength, and has good development prospects in the fields of peak clipping and valley filling of the current power grid, waste heat recovery, building energy conservation and the like.
However, the greatest limitation of the development of the existing energy storage technology is that: the phase-change material has higher energy storage density, but the heat conductivity coefficient is lower, so that the charging and discharging cycle is prolonged, the energy storage/release efficiency is reduced, the shutdown maintenance cost is increased rapidly due to the integration of the device, and the invention is particularly provided for responding to the national policy and promoting the further development of the energy storage technology.
Disclosure of Invention
In view of the above, based on the decoupling requirement of storage and release of the electric-thermal energy in the current peak clipping and valley filling measures on space-time, the invention provides a high-efficiency peak-and-frequency-modulation sectional type electric-drive current-coupled electric-heating energy storage-release device, which can efficiently and quickly store the electric/thermal energy which cannot be directly stored, and further improve the comprehensive utilization rate of the energy, in order to solve the problems of long heat charging and discharging period caused by low heat conductivity coefficient of the phase-change material and high shutdown maintenance cost and low energy storage-release efficiency caused by integration of the device in the current energy storage-release process.
In order to realize the purpose, the invention adopts the following technical scheme: a sectional type electric drive current coupling electric heating energy storage-release device comprises a fluid inlet guide pipe, a spiral electric heating pipe, an energy storage unit, a packaging tank body, a heat insulation layer, an adjustable power supply, a fluid outlet guide pipe, a drive electrode, a partition plate, an energy storage/release cavity, a phase change material and a fluid working medium; the energy storage unit comprises an upper layer of partition plate, a lower layer of partition plate and a concentric circular ring type energy storage/release cavity, and driving electrodes are arranged on the upper side and the lower side of the partition plate; the energy storage units are arranged in series and are wrapped in the packaging tank body, a plurality of fluid inlet conduits are arranged at the uppermost end of the partition plate, a plurality of fluid outlet conduits are arranged at the lowermost end of the partition plate, and an insulating tank body is arranged at the outermost layer of the device;
the spiral electric heating pipe penetrates through all the energy storage units connected in series through a through hole structure in the middle of the partition plate, the phase-change material is filled in the energy storage/release cavity, and a fluid working medium is introduced into a cavity formed among the partition plate, the energy storage/release cavity and the packaging tank body; the upper/lower planes of the partition board directly contacting the phase-change material and the fluid working medium are provided with driving electrodes, a high-strength electric field is formed between heterogeneous electrodes of the driving electrodes through an adjustable power supply, and the liquid phase-change material forms clockwise/counterclockwise circular flow in the energy storage/release cavity.
Furthermore, the output power of the spiral electric heating pipe is controlled by a first switch; when the fluid working medium stores energy, the heat is input and the energy is released to output the heat, and the heat is controlled by a second switch; and the electric field intensity output by the adjustable power supply is controlled by a third switch.
Furthermore, a plurality of energy storage units are arranged in series up and down, the number of series operation is set according to the load required to be adjusted, and the energy storage units are packaged by a packaging tank body; two adjacent energy storage units share one partition plate, namely, the lower partition plate of the upper energy storage unit is the upper partition plate of the lower energy storage unit.
Furthermore, driving electrodes are arranged on the upper/lower planes of the partition board which is directly contacted with the phase-change material and the fluid working medium, the driving electrodes and the partition layer form an electrode partition layer, the area on the plane of the electrode partition layer, which is contacted with the phase-change material, is a phase-change material circulation area, and the area, which is contacted with the fluid working medium, is a fluid working medium flowing area.
Furthermore, the driving electrodes are arranged in a radial shape, the positive/negative electrodes are arranged in a concentric annular interval base ring structure, and electrode needle bodies are uniformly arranged along the circumferential direction in the radial direction, so that clockwise/anticlockwise driving of fluid in the heterogeneous electrode area is realized (if the first layer is arranged as the negative electrode, the second layer is arranged as the positive electrode); the electrode base ring of the middle layer is internally and externally provided with electrode needle bodies, the electrode base ring of the first layer is provided with needle body electrodes which are radially outward, the base ring of the outermost layer is provided with needle body electrodes which are radially inward, and the number of the crossed heterogeneous electrode needle bodies is equal.
Furthermore, fluid through holes for enabling a fluid working medium to flow are reserved on the partition plates, the number of the fluid through holes is the same as that of the electrode needle bodies, and the fluid through holes are uniformly distributed in the fluid working medium area (except for the uppermost partition plate and the lowermost partition plate) in a multilayer annular mode along the circumferential direction; and a through hole for arranging the spiral electric heating pipe is reserved in the center of each partition plate.
Furthermore, an insulating protective coating is coated on a plane formed by the driving electrode and the partition plate in the fluid working medium area.
Furthermore, the partition plates are internally provided with positive enameled wires and negative enameled wires, the positive enameled wires in each partition plate are connected in series, the external part of each partition plate is connected with the positive electrode of an adjustable power supply, and the internal part of each partition plate is connected with the positive electrode of a driving electrode; the negative pole enameled wire of every space bar is established ties each other, and the adjustable power negative pole is connected to the outside, internal connection the negative pole of drive electrode.
Furthermore, the energy storage units which are overlapped and serially arranged up and down are packaged into a whole by the packaging tank body, through holes for arranging the fluid inlet guide pipe and the fluid outlet guide pipe are reserved on the upper wall surface and the lower wall surface of the packaging tank body, and through holes for an external adjustable power supply are reserved on the side wall surface; the outermost layer of the device is provided with a heat insulation layer, and the through hole positions of the heat insulation layer correspond to the through hole positions of the packaging tank body one by one.
An energy storage method of the segmented electrically-driven current coupling electrically-heated energy storage-release device comprises the following steps:
(1) energy storage process:
A. the phase change material is completely solid phase in an initial state;
B. when the input excess energy exists in the form of electric energy, the external heat source uses a spiral electric heating pipe, a first switch is turned on, electric quantity is converted into heat, and then the heat is transmitted to the phase-change material;
C. when the input excess energy is heat energy, the external heat source is set to pass through a hot fluid working medium, the heat input of the working medium is controlled by a second switch, and the heat is rapidly transmitted to the phase-change material through a lantern ring structure of the energy storage/release cavity; the phase-change material absorbs heat, and when the temperature exceeds the phase-change temperature, the solid phase is melted into a liquid phase; in the early phase change stage, heat is mainly input by a heat source for strengthening the energy storage phase change, the heat is mainly in a heat conduction mode, the liquid phase ratio in the device is increased in the later phase change stage along with the melting of a solid phase, and under the action of the driving electrodes arranged on the upper partition plate and the lower partition plate of each energy storage unit, a liquid phase change material forms clockwise/anticlockwise macroscopic circulating flow in the energy storage/release cavity under the action of an electric field force controlled by a third switch, so that the thermal disturbance of the device at the moment is enhanced, and the energy storage efficiency is further improved;
D. when the input surplus energy is the simultaneous existence of electric energy and heat energy, the first switch and the second switch are simultaneously turned on, in the energy storage process, the phase-change material absorbs the heat of the spiral electric heating pipe and absorbs the heat from the hot fluid working medium, the speed of the phase-change process in a complete liquid phase state is accelerated under the driving of the electric fluid controlled by the third switch, and the energy storage efficiency of the device is further improved;
(2) the energy release process is as follows:
the first switch is closed in the energy releasing process, the second switch controls and switches the cold fluid working medium to enable the cold fluid working medium to enter the fluid channel layer to absorb heat from the phase change material of the high-temperature liquid phase, and the high-temperature phase change material in the energy storage/release cavity is controlled by the third switch, due to the influence of the double layers of driving electrodes, the static solidification process in the energy storage unit is broken, the heat in the cavity is continuously driven to the heat exchange wall surface of the cold fluid and the hot fluid, the whole circulation process is strengthened, the heat is rapidly and uniformly released and is transferred to the cold fluid working medium, and the energy releasing process of the system is rapidly completed.
Compared with the traditional energy storage device, the technical scheme provided by the invention mainly has the following technical advantages that:
1. the invention considers the intermittent and unstable electricity/heat energy storage requirements of the power plant, quickly converts the electricity/heat energy required to be stored into heat energy to realize energy storage peak clipping when the energy is excessive, and releases energy to fill valley in the energy consumption peak period to realize the decoupling of the thermoelectricity on time-space-intensity.
2. The invention adopts a mode of mutual coupling of electrofluid drive and external heat source heating, and in the early stage of the solid-liquid phase change process, the strengthening means mainly adopts external heat source heating, and the solid phase change material quickly absorbs heat from an external heat source (electric heating pipe/circulating pipeline heat input) and is melted into liquid at the highest speed; in the later stage of solid-liquid phase change, when the liquid phase in the device is increased, the strengthening means mainly takes electrofluid to drive heat transfer, and each energy storage unit is provided with a double-drive electrode structure, so that the high-speed self-circulation of the liquid phase can be realized in the energy storage-release cavity under the action of an electric field, the thermal disturbance of a phase change material in the energy storage-release cavity is further enhanced, the heat charging and discharging period of the solid-liquid phase change is shortened, and the energy utilization rate and the energy storage-release efficiency of the system can be obviously improved.
3. The invention realizes the integrated requirement of energy storage and release, focuses on the enhancement of the energy storage and release processes, the annular energy storage and release cavities and the cold/hot fluid working medium are arranged in a concentric annular staggered mode, and each energy storage unit is provided with a driving electrode structure, which is different from the static melting and solidification processes of other energy storage and release devices.
4. The device provided by the invention enhances the thermal gradient at the cold and hot wall surfaces in the energy storage/release process while maximally increasing the heat transfer area between the fluid and the phase-change material, so that the cold/heat of the phase-change material in the cavity is continuously driven to the heat exchange wall surface, the heat is rapidly and uniformly transferred in the whole process, and the heat transfer efficiency is continuously enhanced, thereby improving the energy storage/release efficiency; the structure integration level is high, the space of the device is reduced to the maximum extent, and compared with gas-liquid phase change equipment, in the solid-liquid phase change energy storage-release process based on the solid-liquid phase change energy storage-release device, the phase change process is stable, the volume change is small, and the temperature change range of the device is small, so that the energy loss of the system is further reduced, and the operation stability of the device is improved.
5. The energy storage units can be connected in series to operate in a combined mode and can also act independently, so that the plurality of energy storage units can ensure independence, reduce the maintenance time cost, improve the strain capacity of the device, and can be separated and maintained independently after circuit detection when a certain unit has a problem, thereby relieving the difficulty of emergency management of the system to the maximum extent.
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 perspective view of one embodiment of the present invention;
FIG. 2 is a schematic diagram of an energy storage unit (front view, spiral electric heating tube not shown) according to an embodiment of the present invention;
FIG. 3 is a detailed view of the drive electrodes of one embodiment of the present invention;
figure 4 is a schematic view of a spacer plate according to one embodiment of the present invention.
In the figure: 1-a fluid inlet tube; 2-a spiral electric heating tube; 3-an energy storage unit; 4-a heat insulation layer; 5-packaging the tank body; 6-an adjustable power supply; 7-a fluid outlet pipe; 8-a drive electrode; 9-a partition plate; 10-energy storage/release chamber; 11-a phase change material; 12-a fluid working substance; 81-phase change material circulation zone; 82-fluid working medium flowing area; 83-drive electrode negative; 84-drive electrode positive electrode; 91-a fluid through hole; 92-positive enameled wire; 93-negative pole enameled wire; 94-spiral electric heating tube arrangement through hole.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely explained below with reference to the drawings in the embodiments of the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict, and the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments.
It should be noted that the size of the embodiment related to the method is set according to the actual thermal control object, and the embodiment described below only explains the present invention, but does not limit the present invention; references herein to "upper," "lower," "front," "back," etc., merely indicate relative positions of structures and not absolute positions.
First embodiment, the present embodiment is described with reference to fig. 1 to 4, and the segmented electrically-driven current-coupled electrically-heated energy storage-release device according to the present embodiment includes: the device comprises a fluid inlet guide pipe 1, a spiral electric heating pipe 2, an energy storage unit 3, a packaging tank 4, a heat insulation layer 5, an adjustable power supply 6, a fluid outlet guide pipe 7, a driving electrode 8, a partition plate 9, an energy storage/release cavity 10, a phase-change material 11 and a fluid working medium 12. The energy storage unit 3 comprises an upper layer of partition plate 9, a lower layer of partition plate 9 and a concentric circular ring type energy storage/release cavity 10, driving electrodes 8 are arranged on the upper side and the lower side of the partition plate 9, a plurality of stacked serial parts are wrapped in the packaging tank body 4, a plurality of fluid inlet conduits 1 are arranged at the uppermost end of the partition plate 9, a plurality of fluid outlet conduits 7 are arranged at the lowermost end of the partition plate, and a heat insulation tank body 5 is arranged on the outermost layer of the device, as shown in fig. 1.
The whole size of the device is set according to the load requirement, and the output power of the spiral electric heating tube 2 is controlled by a first switch; when the fluid working medium 12 stores energy, heat is input, and energy is released to output heat, and the heat is controlled by a second switch; the voltage value output by the adjustable power supply 6 determines the electric field intensity between the positive electrode and the negative electrode of the driving electrode 8 and is controlled by a third switch.
The spiral electric heating pipe 2 penetrates through all the energy storage units 3 connected in series through a through hole structure in the middle of the partition plate 9, and generates heat after being powered on; optionally, the electric heating tube may be single-ended or multi-ended, and may be made of steel, copper, or alloy. Preferably, the spiral electric heating tube 2 is a single-end copper wire-silica gel electric heating tube; preferably, the spiral electric heating pipe 2 is arranged at the middle position of the device in a bolt and screw connection mode.
The energy storage units 3 comprise an upper layer of partition plate 9, a lower layer of partition plate 9 and a concentric circular ring type energy storage/release cavity 10, driving electrodes 8 are arranged on the upper side and the lower side of the partition plate 9, the energy storage units 3 are arranged in series from top to bottom, the number of series operation is set according to the load required to be adjusted, and the energy storage units are packaged by a packaging tank body 4; two adjacent energy storage units 3 are arranged to share one partition plate 9, that is, the lower partition plate of the upper energy storage unit is the upper partition plate of the lower energy storage unit, and preferably, 4 energy storage units 3 connected in series are arranged in the embodiment, as shown in fig. 1 and fig. 2.
The packaging tank body 4 is used for packaging the energy storage unit 3, through holes for arranging the fluid inlet guide pipe 1 and the fluid outlet guide pipe 7 are reserved on the upper wall surface and the lower wall surface of the packaging tank body 4, and through holes for an external adjustable power supply 6 are reserved on the side wall surface; the material of the packaging tank body 4 must meet the requirements of high heat insulation and high insulativity; the packaging tank body 4 is fixed on the partition plate 9 in a clamping groove embedding manner; the heat insulation layer 5 is arranged on the outermost layer of the device, and the through hole position of the heat insulation layer 5 corresponds to the through hole position of the packaging tank body 4 one by one.
The driving electrode 8 is arranged on the upper/lower plane of the spacing plate 9 directly contacting the phase-change material 11 and the fluid working medium 12, the driving electrode 8 and the spacing layer 9 form a smooth electrode spacing layer, and the area on the plane of the electrode spacing layer, which is contacted with the phase-change material 11, is a phase-change material circulation area 81, as shown in the shaded area in fig. 3; the area in contact with fluid working medium 12 is fluid working medium flowing area 82, which is a blank area as shown in fig. 3, and fluid working medium area 82 is coated with an insulating protective coating to prevent fluid working medium 12 from corroding drive electrode 8. Preferably, the inter-electrode interlayer plane of the present embodiment is divided into 5 regions, the central position is the through hole position of the spiral electric heating tube 2, the first layer of ring and the third layer of ring are provided with the phase change material circulation region 81, and the second layer of ring and the fourth layer of ring are provided with the fluid working medium flow region 82.
The driving electrodes 8 are arranged in a radial shape, the positive/negative electrodes are arranged in a concentric annular interval base ring structure, and electrode needle bodies are uniformly arranged along the circumferential direction in the radial direction, so that the clockwise/counterclockwise driving of fluid in a heterogeneous electrode area is realized; electrode needle bodies are arranged on the inner side and the outer side of the electrode base ring of the middle layer, the needle body electrodes which are radially outward are arranged on the first layer base ring, the needle body electrodes which are radially inward are arranged on the outermost layer base ring, and the number of the crossed groups of the electrode needle bodies is equal, as shown in figure 3; preferably, in this embodiment, the first layer of circular rings is set as a negative electrode, the second layer is set as a positive electrode, and the third layer is a negative electrode; preferably, the electrode needles on the electrode base ring are uniformly arranged, and the number of the electrode needles is set to be 8. Preferably, the driving electrode 8 is made of a material with high thermal and electrical conductivity, such as copper, silver, graphene, etc. Preferably, the drive electrodes 8 are arranged on the plane of the spacer 9 by means of channel fitting, adhesive bonding, screw-bolt, printing or jet printing, etc.
The inner part of each partition plate 9 is provided with a positive enameled wire 92 and a negative enameled wire 93, the positive enameled wires 92 in each partition plate 9 are connected in series, the outer part of each partition plate is connected with the positive electrode of the adjustable power supply 6, and the inner part of each partition plate is connected with the positive electrode 84 of the driving electrode 8; the negative enameled wires 93 of each partition board 9 are connected in series, externally connected to the negative electrode of the adjustable power supply 6, and internally connected to the negative electrode 83 of the driving electrode 8, as shown in fig. 4; optionally, the partition plate 9 is made of a high thermal conductive insulating material, such as ceramic, high thermal conductive silicone, or the like.
The partition plate 9 is provided with fluid through holes 91 for enabling the fluid working medium 12 to flow, the number of the fluid through holes is the same as that of the electrode needle bodies, and the fluid through holes are uniformly distributed in the fluid working medium area 82 (except the uppermost partition plate and the lowermost partition plate) in a multilayer annular mode along the circumferential direction; a through hole 94 for arranging the spiral electric heating pipe 2 is reserved at the center of each partition plate 9; preferably, the present embodiment provides 2 fluid through holes, and 8 fluid through holes are uniformly provided on the circumference of each fluid through hole, as shown in fig. 3 and 4.
The fluid inlet conduit 1 is arranged above the uppermost energy storage unit 3, the fluid outlet conduit 7 is arranged below the lowermost energy storage unit 3, and the fluid working medium 12 flows in from the fluid inlet conduit 1 and then flows out from the fluid outlet conduit 7 through a through hole structure on the partition plate 9. The fluid inlet conduit 1 and the fluid outlet conduit 7 are arranged on the packaging tank body 4 in a bolt and screw connection mode; preferably, the fluid inlet conduit 1 and the fluid outlet conduit 7 are made of insulating material.
A fluid working medium 12 is introduced into a cavity formed among the partition plate 9, the energy storage/release cavity 10 and the packaging tank body 4; the energy storage/release cavity 10 is filled with a phase-change material 11, a high-intensity electric field is formed between the heterogeneous electrodes of the driving electrode 8 through the adjustable power supply 6, and the liquid phase-change material 11 forms clockwise/counterclockwise circulating flow in the energy storage/release cavity 10, as shown in fig. 2. In order to avoid volume expansion generated in the phase change process of the phase change material, the cavity structure is not filled with the phase change material; preferably, the phase-change material 11 is selected to be filled in the energy storage-release cavity 10 according to the electric/thermal load, and the material is an insulator or a weak electrolyte; preferably, the embodiment considers the operation cost of the phase-change material 11 to be paraffin under the premise of ensuring the energy storage effect.
The invention relates to a sectional type electric drive current coupling electric heating energy storage-release device, taking the peak-load-shifting energy storage-release process as an example, the working principle and the flow are explained as follows:
(1) energy consumption low ebb: inputting surplus electric energy into the system to the spiral electric heating tube 2 and the driving electrode 8, and pumping and adjusting a part of hot working medium to enter the device, wherein the phase-change material 11 in the device is completely solid-phase in an initial state; the first switch and the third switch are turned on, the spiral electric heating tube 2 is used for converting electric quantity into heat, and then the heat is transmitted to the phase-change material 11; the heat of the working medium 12 is quickly transferred to the phase-change material 11 through a lantern ring structure of the energy storage/release cavity 10 under the control of a second switch; the phase-change material 11 absorbs heat, and when the temperature exceeds the phase-change temperature, the solid phase is melted into a liquid phase; in the early phase change period, the heat output transmission of the energy storage phase change is mainly in a heat conduction mode, along with the melting of a solid phase, the liquid phase proportion in the energy storage/release cavity 10 is increased in the later phase change period, the thermal disturbance of the heat exchange wall surface is enhanced under the action of the driving electrode 8 on the partition plate 9 of each energy storage unit, and the liquid phase change material 11 forms clockwise/anticlockwise macroscopic circulation flow in the energy storage/release cavity 10, so that the thermal disturbance of the device at the moment is enhanced, and the energy storage efficiency is further improved;
(2) energy consumption peak: at the moment, the previously stored heat energy is rapidly released, the first switch is closed in the energy release process, the second switch controls and switches the cold fluid working medium 12, so that the cold fluid working medium enters the fluid channel layer to absorb the heat from the phase change material 11 of the high-temperature liquid phase, and the high-temperature phase change material 11 in the energy storage/release cavity 10 is controlled by the third switch, due to the influence of the driving electrode 8, the static solidification process in the energy storage unit 3 is broken, the heat in the cavity is continuously driven to the cold and hot fluid heat exchange wall surface, the whole circulation process is strengthened, the heat is rapidly and uniformly released and is transferred to the cold fluid working medium 12, and the energy release process of the system is rapidly completed.
The invention provides a sectional type electric drive current coupling electric heating energy storage-release device, which firstly considers the storage and release of intermittent and unstable electric/thermal energy, quickly converts the energy (electricity/heat) to be stored into heat energy to realize the peak clipping of stored energy when the energy is excessive, and fills the valley by releasing the energy of the heat energy during the peak period of energy consumption, thus solving the problem of unmatched time-space-intensity energy storage-release; the problems of high outage and maintenance cost and difficulty in emergency management of equipment caused by device integration are solved; finally, the invention integrates a heat-electricity multi-mode decoupling mode, and enhances the thermal disturbance in the energy storage-release process to the maximum extent on the premise of energy saving through external heat source heating and electrofluid driving, thereby solving the problem of long energy storage-release period and improving the energy utilization rate of the system and the response rate of deep peak regulation.
The phase-change material absorbs the redundant energy to be stored when the energy demand is low based on the solid-liquid phase-change process, the energy storage process is realized by changing the solid phase into the liquid phase, meanwhile, when the energy demand is high, the liquid phase releases heat to become the solid phase to complete the energy release process, the energy storage-release processes are all carried out at a nearly constant temperature, and the rapid energy storage is realized by the mode of coupling the electric fluid drive with the external heat source for heating.
When the input surplus energy exists in the form of electric energy in the energy storage process, the external heat source uses the spiral electric heating tube 2 to convert the electric quantity into heat and then transmits the heat to the phase-change material 11 wrapped near the electric heating tube; when the input surplus energy is heat energy, the external heat source is directly the input hot fluid working medium 12, and the heat energy of the fluid working medium 12 is rapidly transferred to the solid phase-change material 11 through the wall surface of the energy storage-release cavity 10; when the input surplus energy exists in the form of heat energy and electric energy, the external heat source is from the spiral electric heating pipe 2 and the hot fluid working medium 12. The phase-change material 11 near the contact heat transfer wall surface inside the energy storage-release cavity absorbs heat until the heat exceeds the phase-change temperature of the phase-change material, at the moment, the phase-change material is melted into a liquid phase from a solid phase, and the liquid phase realizes high-speed self-circulation in the energy storage-release cavity under the action of the electric field of the dual-drive electrode 8, so that the thermal disturbance of the phase-change material in the energy storage-release cavity is further enhanced, and the heat charging period is shortened.
In the energy releasing process, the direction of energy transmission and the direction of energy storage are opposite, when a working medium interface is switched, a cold fluid working medium 11 enters the device, a fluid channel layer absorbs heat from a phase-change material 11 in a high-temperature liquid phase and absorbs heat from the phase-change material 11, the driving electrode 8 breaks through the static solidification process in the energy storage unit 3, the heat in the cavity is continuously driven to the heat exchange wall surface, the whole circulation process is strengthened, the heat is rapidly and uniformly released and is transferred to the cold fluid working medium 12, and the energy releasing process of the system is rapidly completed.
The embodiments of the invention disclosed above are intended merely to aid in the explanation of the invention. The examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention.
Claims (10)
1. A segmented electric drive current coupling electric heating energy storage-release device is characterized in that: the energy storage device comprises a fluid inlet guide pipe (1), a spiral electric heating pipe (2), an energy storage unit (3), a packaging tank body (4), a heat insulation layer (5), an adjustable power supply (6), a fluid outlet guide pipe (7), a driving electrode (8), partition plates (9), energy storage/release cavities (10), phase change materials (11) and fluid working media (12), wherein the energy storage unit (3) comprises an upper partition plate (9) and a lower partition plate (9) and a concentric ring type energy storage/release cavity (10), the driving electrodes (8) are arranged on the upper side and the lower side of each partition plate (9), the energy storage units (3) are connected in series and are coated in the packaging tank body (4), the uppermost ends of the partition plates (9) are provided with a plurality of fluid inlet guide pipes (1), the lowermost ends of the partition plates are provided with a plurality of fluid outlet guide pipes (7), and the outermost layer of the device is provided with the heat insulation layer (5);
the spiral electric heating pipe (2) penetrates through all the energy storage units (3) connected in series through a through hole structure in the middle of the partition plate (9); phase-change materials (11) are filled in the energy storage/release cavity (10), fluid working media (12) are introduced into a cavity formed among the partition plate (9), the energy storage/release cavity (10) and the packaging tank body (4), driving electrodes (8) are arranged on the upper/lower planes of the partition plate (9) which directly contact with the phase-change materials (11) and the fluid working media (12), a high-intensity electric field is formed between heterogeneous electrodes of the driving electrodes (8) through an adjustable power supply (6), and the liquid phase-change materials (11) form clockwise/counterclockwise circulating flow in the energy storage/release cavity (10).
2. The segmented electrically driven current coupled electrically heated energy storage-release device of claim 1, wherein: the output power of the spiral electric heating pipe (2) is controlled by a first switch; when the fluid working medium (12) stores energy, heat is input and output by releasing the energy, and the heat is controlled by a second switch; the electric field intensity output by the adjustable power supply (6) is controlled by a third switch.
3. The segmented electrically driven current coupled electrically heated energy storage-release device of claim 1, wherein: the energy storage units (3) are vertically arranged in series, the number of the series operation is set according to the load required to be adjusted, and the series operation is packaged by a packaging tank body (4); two adjacent energy storage units (3) are arranged to share one partition plate (9).
4. The segmented electrically driven current coupled electrically heated energy storage-release device of claim 1, wherein: the driving electrode (8) is arranged on the upper/lower plane of a partition plate (9) which is directly contacted with the phase-change material (11) and the fluid working medium (12), the driving electrode (8) and the partition plate (9) form an electrode partition layer, the area on the plane of the electrode partition layer, which is contacted with the phase-change material (11), is a phase-change material circulation area (81), and the area, which is contacted with the fluid working medium (12), is a fluid working medium flowing area (82).
5. The segmented electrically driven current coupled electrically heated energy storage-release device of claim 4, wherein: the driving electrodes (8) are arranged in a radial shape, the positive/negative electrodes are arranged in a base ring structure at intervals in a concentric ring shape, and electrode needle bodies are uniformly arranged along the circumferential direction in the radial direction, so that the clockwise/counterclockwise driving of fluid in a heterogeneous electrode area is realized; the electrode base ring of the middle layer is internally and externally provided with electrode needle bodies, the electrode base ring of the first layer is provided with radially outward needle body electrodes, the base ring of the outermost layer is provided with radially inward needle body electrodes, and the number of the crossed heterogeneous electrode needle bodies is equal.
6. The segmented, electrically driven, current-coupled, electrically heated, energy storage-release device of claim 1 or 4, wherein: fluid through holes (91) for enabling the fluid working medium (12) to flow are reserved on the partition plate (9), the number of the fluid through holes is the same as that of the electrode needle bodies, and the fluid through holes are uniformly distributed in a fluid working medium flowing area (82) in a multilayer annular mode along the circumferential direction; the center of each partition plate (9) is provided with a through hole (94) for arranging the spiral electric heating pipe (2).
7. The segmented electrically driven current coupled electrically heated energy storage-release device of claim 1 or 4, wherein: and an insulating protective coating is coated on a plane formed by the driving electrode (8) and the partition plate (9) in the fluid working medium flowing area (82).
8. The segmented electrically driven current coupled electrically heated energy storage-release device of claim 1, wherein: the utility model discloses a driving electrode's structure, including the internal layout of space bar (9) has anodal enameled wire (92) and negative pole enameled wire (93), anodal enameled wire (92) in every space bar (9) establish ties each other, and external connection adjustable power source (6) are anodal, anodal (84) of internal connection driving electrode (8), and negative pole enameled wire (93) of every space bar (9) establish ties each other, and external connection adjustable power source (6) negative pole, negative pole (83) of internal connection driving electrode (8).
9. The segmented electrically driven current coupled electrically heated energy storage-release device of claim 1, wherein: the packaging tank body (4) packages the energy storage units (3) which are stacked up and down and arranged in series into a whole, through holes for arranging the fluid inlet guide pipe (1) and the fluid outlet guide pipe (7) are reserved on the upper wall surface and the lower wall surface of the packaging tank body (4), and through holes for an external adjustable power supply (6) are reserved on the side wall surface; the outermost layer of the device is provided with a heat insulation layer (5), and the through holes of the heat insulation layer (5) are in one-to-one correspondence with the through holes of the packaging tank body (4).
10. A method of storing energy in a segmented electrically driven current coupled electrically heated energy storage and release device according to any of claims 1 to 9, wherein: the method specifically comprises the following steps:
(1) energy storage process:
A. the phase change material (11) is completely solid in an initial state;
B. when the input excess energy exists in the form of electric energy, the external heat source uses the spiral electric heating pipe (2), the first switch is turned on, the electric quantity is converted into heat, and then the heat is transmitted to the phase-change material (11);
C. when the input excess energy is heat energy, the external heat source is arranged to pass through a hot fluid working medium (12), the heat input of the working medium is controlled by a second switch, and the heat is rapidly transmitted to the phase-change material (11) through a lantern ring structure of the energy storage/release cavity (10); the phase-change material (11) absorbs heat, and when the temperature exceeds the phase-change temperature, the solid phase is melted into a liquid phase; in the early phase change period, heat is mainly input by a heat source for strengthening the energy storage phase change, the heat is mainly in a heat conduction mode, the liquid phase ratio in the device is increased in the later phase change period along with the melting of a solid phase, and under the action of a driving electrode (8) arranged on an upper partition plate (9) and a lower partition plate (9) of each energy storage unit, a liquid phase change material (11) forms clockwise/anticlockwise macroscopic circulating flow in an energy storage/release cavity (10) under the action of electric field force controlled by a three-switch, so that the thermal disturbance of the device at the moment is enhanced, and the energy storage efficiency is further improved;
D. when the input surplus energy is the simultaneous existence of electric energy and heat energy, the first switch and the second switch are simultaneously opened, in the energy storage process, the phase-change material (11) absorbs the heat of the spiral electric heating tube and absorbs the heat from the hot fluid working medium (12), the speed of the phase-change process in a complete liquid phase state is accelerated under the driving of the electric fluid controlled by the third switch, and the energy storage efficiency of the device is further improved;
(2) the energy release process is as follows:
the first switch is closed in the energy releasing process, the second switch controls and switches the cold fluid working medium (12), the cold fluid working medium enters the fluid channel layer to absorb heat from the phase change material (11) of the high-temperature liquid phase, and the high-temperature phase change material (11) in the energy storage/release cavity (10) is controlled by the third switch, due to the action of the double-layer driving electrode (8), the static solidification process in the energy storage unit (3) is broken, the heat in the cavity is continuously driven to the cold and hot fluid heat exchange wall surface, the whole circulation process is strengthened, the heat is rapidly and uniformly released and is transferred to the cold fluid working medium (12), and the energy releasing process of the system is rapidly completed.
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