CN107300258B - Low-valley electricity and abandoned wind electricity utilization device based on heat for cascade heat storage - Google Patents
Low-valley electricity and abandoned wind electricity utilization device based on heat for cascade heat storage Download PDFInfo
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- CN107300258B CN107300258B CN201610239041.5A CN201610239041A CN107300258B CN 107300258 B CN107300258 B CN 107300258B CN 201610239041 A CN201610239041 A CN 201610239041A CN 107300258 B CN107300258 B CN 107300258B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H7/00—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release
- F24H7/02—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid
- F24H7/04—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid
- F24H7/0408—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using electrical energy supply
- F24H7/0416—Storage heaters, i.e. heaters in which the energy is stored as heat in masses for subsequent release the released heat being conveyed to a transfer fluid with forced circulation of the transfer fluid using electrical energy supply the transfer fluid being air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0052—Details for air heaters
- F24H9/0073—Arrangement or mounting of means for forcing the circulation of air
- F24H9/0078—Arrangement or mounting of means for forcing the circulation of air for storage heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
- F24H9/1863—Arrangement or mounting of electric heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
- F24H9/2071—Arrangement or mounting of control or safety devices for air heaters using electrical energy supply
- F24H9/2078—Storage heaters
Abstract
The application provides a low-valley electricity and wind-discarding electricity utilization device based on heat for cascade heat storage, which uses high-pressure low-valley electricity/wind-discarding electricity to heat circulating air to be above a designed storage temperature, and the heated high-temperature circulating air is heated step by step through heat storage materials in different areas of a heat storage chamber, and realizes heat storage process control through a temperature controller; when the electricity consumption peak or the non-air discarding period needs to use heat, the circulating fan is regulated and controlled, the circulating air is driven to enter the heat storage layer to exchange heat with the heat storage layer, the heated air exchanges heat with the heat transfer fluid driven by the circulating pump through the heat exchanger, the heat energy is transferred to the hot user side, the temperature of the air after heat exchange is reduced, and the circulation is realized through the circulating fan; according to the application, the heating element is separated from the heat storage layer, and the heat storage layer is separated from the heat supply area, so that the safety problem of conduction of the heat storage material in the existing high-voltage electric heating energy storage device under high temperature and high voltage is solved, and meanwhile, the temperature front edge in the heat storage layer is regulated and controlled through the control of the heat storage layer partition and the circulating wind, so that the gradient storage and the utilization of heat are realized.
Description
Technical Field
The application relates to the technical fields of energy conservation, energy storage, electric power and thermal peak regulation, heat energy engineering and the like, in particular to a device for utilizing off-peak electricity and abandoned wind electricity based on heat for cascade heat storage, which can be applied to the fields of large-scale heat supply, electric power and thermal peak regulation, renewable energy utilization and the like.
Background
In recent years, the development of the electric power industry in China is rapid, however, with the rapid growth of life, industry and business electricity consumption of people, the tension condition of the electric power supply in the peak period of electricity consumption in China is still serious, and correspondingly, a large amount of off-peak electricity cannot be effectively utilized. Meanwhile, in recent years, the renewable energy industry is rapidly developed in China, and the problem of surfing the Internet with renewable power is caused, so that a large amount of problems such as wind abandoning, light abandoning and water abandoning are caused. These conditions accelerate the development and continuous innovation and upgrading of comprehensive energy utilization technologies, wherein the role of heat storage technologies is more and more important, the basic principle of the technology is that redundant (low-price) electricity is converted into heat form for storage during electricity consumption low-valley period or wind power abandonment period, and the surplus (low-price) electricity is released for recycling during electricity consumption peak period or when needed, so that the purposes of peak clipping and valley filling, operation cost reduction and effective utilization of renewable energy sources are achieved.
Technology of heating, heat storage and heat utilization based on off-peak electricity or abandoned wind electricity has been put into practical use in recent years; the patent cn201320282194.X provides an electric heat storage type hot blast stove, the main principle is that electric energy is converted into heat energy to be stored in a heat accumulator containing heat storage materials, air is heated to be output through an air-air exchanger, wherein the heat accumulator comprises an electric heating type heat storage-release structure, the air-air exchanger is composed of a plurality of U-shaped metal finned tubes connected with an air distributor, and the device is suitable for electric heat storage with a voltage level of tens of thousands of volts; patent CN201210159123.0 provides an ultrahigh voltage electrothermal energy storage device, which divides a heat storage body into a plurality of split heat storage bodies to be connected in series, solves the problem of overhigh voltage of a single heat storage body end, is suitable for various voltage grades above 10kV, but the voltage difference of the two ends of an outgoing line of an electric heating wire in each split heat storage body is smaller than the minimum breakdown voltage of the heat storage body; patent CN02129252.3 provides an integrated phase-change energy-storage electricity-consumption heat supply technology and device, which completes the heat storage, heat release and heating processes of the phase-change heat storage material through the heat transfer of an electric heating pipe, a heat conduction fin and a heat exchange coil, and the heat conduction metal fin vertically penetrates through a heating sleeve in parallel, so that the heat storage material can be heated uniformly. The above-described patent techniques have one or more of the following problems. One of the problems is that a sensible heat storage mechanism is adopted, and the design defect of the system is added, so that the heat output temperature of the system is continuously reduced along with time in the heat utilization process, and the heat supply process is difficult to stabilize even if a complex control technology is used; the second problem is that the conduction problem of the material at high temperature is different from the common industrial electricity and domestic electricity, when the high-voltage electricity is converted into heat energy, the heat storage and release rate requirement and the heat transfer performance of the material are considered, and the conductivity of the material is considered, particularly the conductivity of the material at high temperature is increased, for example, for the widely-used MgO solid sensible heat storage material, the material becomes a conductor when the temperature is higher than about 500 ℃ at high voltage, so that the heat storage density of the system is limited, and the potential safety problem exists; the third problem is that the staged storage and staged utilization of thermal energy cannot be achieved. These above issues place challenging demands on the selection of heat storage materials, the placement and insulation of heating electrodes, system design, operating temperature range and control, internal structure of the heat storage system, etc. The phase-change heat storage material is paid more attention to due to the high heat storage density, however, for many phase-change heat storage materials, especially inorganic salt materials, the phase-change heat storage material is conductive in the phase-change process, so that the method of directly contacting the heating element and the heat storage material in many patent technologies is not applicable at high temperature and high voltage, and the application of the phase-change heat storage material in high-voltage low-valley electricity or wind-discarding electricity heat storage is limited; therefore, a novel off-peak electricity/abandoned wind electricity heating-heat storage-heat utilization technology needs to be developed, so that the novel off-peak electricity/abandoned wind electricity heating-heat storage-heat utilization technology can safely and stably work at high voltage and high temperature, and the requirements of large-scale electric power and thermal peak regulation and the efficient utilization of renewable energy sources are met.
Disclosure of Invention
The application aims to solve the problems of conduction, low heat storage density, unstable heat supply and the like of the existing high-voltage high-temperature heat storage materials, realize the cascade storage and release of heat energy, improve the heat energy utilization rate and can be used for large-scale heat supply, electric power peak regulation and effective utilization of renewable energy sources.
In order to achieve the purpose, the application provides a low-valley electricity and abandoned wind electricity utilization device based on cascade heat storage and heat utilization, which comprises a circulation control unit, a heat storage/release unit and a heat user unit;
the circulating control unit comprises a circulating fan, an electric heating chamber, an electric control unit, an airflow channel and an outer wall heat insulation layer; the circulating fan comprises a fan controller, is positioned in an airflow channel at the upstream of the electric heating chamber and is used for providing circulating air in the heat storage and release processes; the fan controller is connected with the electric power control unit and the heat user unit and is used for adjusting the circulating wind speed and the wind temperature; the electric heating chamber is positioned in an airflow channel between the circulating fan and the heat storage chamber, is connected with the electric control unit, comprises an electric heating element and a thermocouple, and is used for converting input high-pressure low-valley electricity/abandoned wind electricity into heat energy and transmitting the heat energy to the heat storage material through radiation and circulating air; the surface of the electric heating element may be coated with an oxidation-resistant and radiation-enhancing coating for improving the life of the heating element and enhancing heat transfer; the electric control unit is positioned outside the system, connected with the electric heating chamber and used for controlling the power and the temperature of the electric heating element, so that the electric heating chamber can safely and stably output heat energy according to requirements during the heat storage period; the air flow channel comprises channels positioned among the heat storage material modules, an electric heating indoor channel and a channel containing a circulating fan and a heat exchanger for supplying heat to a heat user, and is used for carrying heat to flow by air flow in the heat supply and heat storage processes; in the heat storage process, part of heat generated by low-valley electricity/abandoned wind electricity is transferred to the heat storage material adjacent to the side of the electric heating chamber (positioned at the front part of the heat storage material layer) through radiation heat transfer, and the other heat is transferred to the heat storage material through an airflow channel between the heat storage material modules carried by circulating wind, so that the temperature rise of the heat storage material is started from the front end of the heat storage material close to the electric heating chamber; the temperature of the circulating air flow at the outlet of the heat storage material is regulated and controlled through the distribution design of the air flow channel and the porous heat insulation layer and the regulation and control of the air flow speed; if heat is not supplied during heat storage, a steep high-temperature front edge in the heat storage material bed is realized through regulation (such as low wind speed), and the low circulating airflow temperature at the outlet of the heat storage material bed is kept; if heat is supplied simultaneously during heat storage, a high-temperature front edge which is diffused in the heat storage material is realized through regulation (such as medium wind speed), so that the temperature of circulating airflow at the outlet of the heat storage material bed meets the heat supply requirement; in the heat release process, the electric heating is stopped, low-temperature circulating air is pressurized by a fan, flows into an airflow channel in the heat storage bed from the front part of the heat storage bed and exchanges heat with the heat storage material, so that the temperature is continuously increased, heated gas flows out from an outlet of the heat storage material bed, heat is transferred to a heat user through a heat supply system heat exchanger, and the temperature of the airflow is reduced and enters the circulating fan in the process, so that the circulating process is realized; the low-temperature gas enters from the front part of the heat storage bed, the low-temperature front edge of the heat storage material bed moves from the upstream to the downstream, meanwhile, the internal flow channels of the heat storage material are arranged in a staggered mode, the porous heat insulation partition plates are used, the wind speed is regulated and controlled, the steep low-temperature front edge can be obtained, the purpose that the temperature of the air flow at the outlet of the heat storage material is constant is achieved, and the heat cascade use and the stable heat supply process are realized;
the heat storage/release unit comprises a heat insulation baffle, a porous radiation heat transfer plate, a porous heat insulation layer and a heat storage layer; the heat insulation partition plate is positioned between the air flow channel where the circulating fan is positioned and the heat storage layer and is used for heat insulation between the part of the air flow channel and equipment thereof and the heat storage layer; the porous radiation heat transfer plate is arranged between the electric heating chamber and the heat storage/release unit and is positioned at the inlet of the air flow of the heat storage/release unit, and the surface of the porous radiation heat transfer plate can contain a radiation coating for enhancing radiation heat transfer; the porous heat insulation layer is used for distributing the air flow with uniform cross section, and also divides the heat storage layer into a plurality of heat storage subareas, so that the heat conduction of the heat storage layer in the air flow direction is reduced, the stable temperature front inside the heat storage layer is maintained, and the cascade storage and release of heat energy are realized;
the heat user unit comprises a temperature controller, a circulating pump, a heat user system and a heat exchanger; the temperature controller comprises a temperature and flow controller, is positioned outside the system and connected with a temperature sensor positioned in the airflow channel and a temperature and flow sensor positioned in the heat user system, and is used for controlling the heat supply temperature of the heat storage/release unit and the input temperature and flow of the heat user system; the circulating pump comprises a heat transfer fluid circulating pipeline which is connected with the heat user system and a heat exchanger positioned in an upstream airflow channel of the circulating fan, and is used for providing power for the heat transfer fluid in the pipeline and transmitting the heat contained in the heat transfer fluid to the heat user system for use; the heat exchanger is positioned in the air flow channel at the upstream of the circulating fan, is connected with the circulating pump and is used for transferring the heat of the hot air in the air flow channel to the heat transfer fluid of the circulating pipeline.
Preferably, the heating element in the electric heating chamber is made of high-temperature resistant, oxidation resistant and corrosion resistant alloy or high-temperature resistant ceramic.
Preferably, the electrical heating element within the electrical heating chamber has a heat transfer expansion surface to enhance heat transfer.
Preferably, an air flow baffle is arranged in the electric heating chamber to increase the air flow residence time and strengthen the heat transfer.
Preferably, the heat-insulating layer and the heat-insulating partition plate can be single-layer or multi-layer, and the heat-insulating layer and the heat-insulating partition plate are made of materials with low heat conductivity coefficients, including foamed plastics, carbonized cork, vermiculite, foamed glass, ceramic fibers, light heat-insulating cotton, microporous calcium silicate, perlite and glass wool.
Preferably, the material of the heat storage layer is an organic or inorganic sensible heat storage material, a latent heat (phase change) heat storage material, a composite structure heat storage material or a combination of the materials, and the use temperature of the heat storage material is in the range of 0-1000 ℃.
Preferably, the circulating fan is a low-power-consumption medium-high-temperature centrifugal fan.
The beneficial effects of the application are as follows: the circulating air is heated to be above the designed storage temperature by using high-pressure low-valley electricity/wind-discarding electricity, the circulating air is heated step by step from a heat storage partition close to the electric heating chamber, the temperature control is arranged at the outlet of the heat storage layer, and the control of the heat charging process and the normal operation of the circulating fan are realized while the sensible heat and the latent heat of the heat storage material are effectively utilized for heat storage; when heat is needed, the electric heating is turned off, circulating air enters the heat storage airflow channel, after the circulating air is heated by the heat storage layer, heat exchange is realized between the circulating air and heat transfer fluid in the heat user unit through the heat exchanger, and the low-temperature air after heat exchange is pressurized by the circulating fan and then exchanges heat with the heat storage layer, so that the circulation of wind is realized; according to the application, the heating element is separated from the heat storage layer, so that the safety problem of high-temperature conduction of the heat storage material in the existing high-voltage electric heating, heat storage and heat utilization technologies is solved, and the safe operation of the system is ensured; because the heat storage area and the heat supply area are separated, the heat storage material can run at high temperature, and the composite phase change heat storage material can be used, the problems of low heat storage density and huge system volume and weight of the traditional heat storage material are solved; meanwhile, the application can realize the cascade storage and cascade utilization of heat, ensure the stability of the temperature of the hot air outlet, improve the heat energy utilization rate and is suitable for large-scale popularization.
Drawings
Fig. 1 is a schematic structural diagram of a device for utilizing low-valley electricity and abandoned wind electricity based on heat for cascade heat storage according to an embodiment of the present application.
In the figure:
1. the heat-insulating device comprises a circulating fan, 2, an electric heating chamber, 3, an electric control unit, 4, an air flow channel, 5, an outer wall heat-insulating layer, 6, a heat-insulating partition board, 7, a porous radiation heat transfer plate, 8, a porous heat-insulating layer, 9, a heat storage layer, 10, a temperature controller, 11, a circulating pump, 12, a heat user system, 13 and a heat exchanger.
Detailed Description
Fig. 1 is a schematic structural diagram of a low-valley electricity and wind-discarding power utilization device based on heat for cascade heat storage according to an embodiment of the present application, and the technical scheme of the present application is further described by the embodiment with reference to the accompanying drawings.
The specific implementation mode of the application is as follows: during low-price valley electricity or wind discarding time period, the circulating fan 1 is started, the electric control unit 3 is started and set to adjust, so that the electric heating element in the electric heating chamber 2 heats circulating air flowing through the electric heating chamber, the hot circulating air firstly uniformly enters the front end of the heat storage layer 9 through the porous radiation plate 7, then enters each partition in the heat storage layer 9 through the air flow channel 4 and the porous heat insulation layer 8 in the heat storage layer 9, heat carried by the hot circulating air is transmitted to each partition of the heat storage layer 9 step by step from front to back in the process, the temperature of the circulating air leaving the heat storage layer 9 is recorded in real time by the temperature controller 10, and the output temperature of the electric heating chamber 2 and the wind speed of the circulating fan 1 are adjusted according to the temperature, so that the temperature of the circulating air flowing back to the circulating fan 1 does not exceed the tolerance temperature of the circulating fan 1, and the requirement on the parameter of the circulating air under the condition that heat is required to be supplied simultaneously during heat storage can be ensured; when the electric heating unit is turned off in a period of off-peak electricity or non-abandoned wind electricity, and heat is required to be supplied in the period, the circulating fan 1 is regulated, the circulating wind exchanges heat with the heat storage material in the heat storage layer 9 to enable the temperature of the circulating wind to be increased, the heated circulating wind carries heat to the heat exchanger 13 through the air flow channel 4 in the heat storage layer 9 and is transmitted to the heat transfer fluid driven by the circulating pump 11, the heat is finally input to the heat user system 12, and the output of the heat is regulated and controlled by the temperature controller 10 and the controller of the circulating fan 1; the temperature of the circulating air passing through the heat exchanger 13 is reduced, and the circulating air is pressurized by the circulating fan 1 and then enters the heat storage layer 9 again, so that the circulating air can be recycled.
The low-valley electricity and wind-discarding power utilization device based on the heat for cascade heat storage provided by the application is Jiangsu 30000m 2 Daytime heating of a market of (2), considering that the design heat load is 40W/m 2 The off-peak electricity period at night is 8 hours, no heat is supplied during heating, the heating time at daytime is 8 hours, the heat supply and heat storage power of the system are 1.2MW, and the total heat storage capacity is 9.6MWh; taking various losses into consideration, designing a 10% allowance, and taking the actual value of the heating power of the heating storage as 1.32MW; the shaped phase-change heat storage material with the heat storage density of 930kJ/kg is used, and the use amount of the heat storage material is about 40 tons. According to Jiangsu province' Su Ji Gong [2011 ]]358 "the price of electricity for large industry, non-preferential treatment, 1-10 kv is: the peak 1.112 yuan/kilowatt-hour, flat section 0.667 yuan/kilowatt-hour, low valley 0.322 yuan/kilowatt-hour, according to utilizing 8 hour low valley electricity to store heat, for 8 hour flat section and 8 hour peak time, average calculation can be obtained, the electricity can be saved by 0.5675 yuan per degree by adopting the low valley electricity utilization device, and the heating season of Jiangsu province is generally from 12 months to 3 months in the coming year, so that about 65 ten thousand yuan can be saved per heating season.
The present application has been described in terms of embodiments, and it will be appreciated by those of skill in the art that various changes can be made to the features and embodiments, or equivalents can be substituted, without departing from the spirit and scope of the application. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the application without departing from the essential scope thereof. Therefore, it is intended that the application not be limited to the particular embodiment disclosed, but that the application will include all embodiments falling within the scope of the appended claims.
Claims (5)
1. The utility model provides a low ebb electricity and abandon wind power utilization device based on step heat storage heat, includes circulation control unit, heat accumulation/release unit and heat user unit, its characterized in that: the circulation control unit comprises a circulation fan (1), an electric heating chamber (2), an electric control unit (3), an air flow channel (4) and an outer wall heat insulation layer (5); the circulating fan (1) comprises a fan controller, is positioned in an air flow channel (4) at the upstream of the electric heating chamber (2) and is used for providing circulating air in the heat storage and release processes; the fan controller is connected with the electric power control unit (3) and the heat user unit and is used for adjusting the circulating wind speed and the wind temperature; the electric heating chamber (2) is positioned in an air flow channel (4) between the circulating fan (1) and the heat storage chamber containing the heat storage layer (9), is connected with the electric control unit (3), comprises an electric heating element and a thermocouple, and is used for converting input high-voltage low-valley electricity/abandoned wind electricity into heat energy and transmitting the heat energy to the heat storage material through radiation and circulating air; the surface of the electric heating element is coated with an oxidation-resistant and radiation-enhancing coating for prolonging the service life of the heating element and enhancing the heat transfer; the electric control unit (3) is positioned outside the system, connected with the electric heating chamber (2) and used for controlling the power and the temperature of the electric heating element, so that the electric heating chamber (2) can safely and stably output heat energy according to requirements during heat storage; the air flow channel (4) comprises a channel positioned in the heat storage layer (9), a channel in the electric heating chamber (2) and a channel containing a circulating fan (1) and a heat exchanger (13) for supplying heat to a heat user, and is used for carrying heat flow and hot air circulation in the heat supply and heat storage process; the heat storage/release unit comprises a heat insulation baffle plate (6), a porous radiation heat transfer plate (7), a porous heat insulation layer (8) and a heat storage layer (9); the heat insulation partition board (6) is positioned between the air flow channel (4) where the circulating fan (1) is positioned and the heat storage chamber containing the heat storage layer (9) and is used for heat insulation between the part of the air flow channel (4) and equipment thereof and the heat storage layer (9); the porous radiation heat transfer plate (7) is arranged between the electric heating chamber (2) and the heat storage chamber containing the heat storage layer (9), and is positioned at the inlet of the air flow of the heat storage chamber, and the surface of the porous radiation heat transfer plate (7) can contain a radiation coating for enhancing radiation heat transfer; the porous heat insulation layer (8) is used for distributing air flow with uniform cross section, and also divides the heat storage chamber into a plurality of heat storage areas so as to reduce heat conduction of the heat storage layer (9) in the air flow direction, maintain a stable temperature front edge in the heat storage layer (9) and realize gradient storage and release of heat energy; the heat user unit comprises a temperature controller (10), a circulating pump (11), a heat user system (12) and a heat exchanger (13); the temperature controller (10) comprises a temperature and flow controller, is positioned outside the system and is connected with a temperature sensor positioned in the airflow channel (4) and a temperature and flow sensor positioned in the heat user system (12) and is used for controlling the heat supply temperature of the heat storage/release unit and the input temperature and flow of the heat user system (12); the circulating pump (11) comprises a heat transfer fluid circulating pipeline, is connected with the heat user system (12) and a heat exchanger (13) positioned in the air flow channel (4) at the upstream of the circulating fan (1) and is used for providing power for the heat transfer fluid in the pipeline and transferring the heat contained in the heat transfer fluid to the heat user system (12) for use; the heat exchanger (13) is positioned in the air flow channel (4) at the upstream of the circulating fan (1), is connected with the circulating pump (11) and is used for transferring the heat of the hot air in the air flow channel (4) to the heat transfer fluid in the circulating pipeline; the heating element in the electric heating chamber (2) is made of high-temperature resistant, oxidation resistant and corrosion resistant alloy or high-temperature resistant ceramic; the electric heating elements within the electric heating chamber (2) are provided with heat transfer expansion surfaces to enhance heat transfer.
2. The device for utilizing electricity from low valley and wind discarding based on heat for cascade heat storage according to claim 1, wherein the device comprises: an air flow baffle is arranged in the electric heating chamber (2) to increase the air flow residence time and strengthen the heat transfer.
3. The device for utilizing electricity from low valley and wind discarding based on heat for cascade heat storage according to claim 1, wherein the device comprises: the outer wall heat insulation layer (5) and the heat insulation partition board (6) are single-layer or multi-layer, and are made of low-heat-conductivity materials including foamed plastics, carbonized cork, vermiculite, foamed glass, ceramic fibers, light heat insulation cotton, microporous calcium silicate, perlite and glass cotton.
4. The device for utilizing electricity from low valley and wind discarding based on heat for cascade heat storage according to claim 1, wherein the device comprises: the heat storage layer (9) is made of organic or inorganic sensible heat storage materials, latent heat storage materials, composite structure heat storage materials or a combination of the materials, and the use temperature of the heat storage materials is 0-1000 ℃.
5. The device for utilizing electricity from low valley and wind discarding based on heat for cascade heat storage according to claim 1, wherein the device comprises: the circulating fan (1) is a low-power-consumption high-temperature centrifugal fan.
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| CN109058767B (en) * | 2018-10-08 | 2023-10-03 | 江苏金合能源科技有限公司 | Nuclear reactor steam storage and heating system |
| CN113294996A (en) * | 2021-07-28 | 2021-08-24 | 广东意利克节能科技有限公司 | Heating furnace with energy-saving and heat-storage functions and using method thereof |
| CN114322624B (en) * | 2021-12-27 | 2022-09-27 | 哈尔滨工业大学 | Energy storage-release device for sectional type electric drive current coupling electric heating |
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