CN114166055B - Heat storage water tank capable of improving heat storage and release efficiency, heat storage and release method and heat supply system - Google Patents
Heat storage water tank capable of improving heat storage and release efficiency, heat storage and release method and heat supply system Download PDFInfo
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- CN114166055B CN114166055B CN202111449346.6A CN202111449346A CN114166055B CN 114166055 B CN114166055 B CN 114166055B CN 202111449346 A CN202111449346 A CN 202111449346A CN 114166055 B CN114166055 B CN 114166055B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D20/0039—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material with stratification of the heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/04—Other direct-contact heat-exchange apparatus the heat-exchange media both being liquids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The invention belongs to the technical field of energy application of a box body, and discloses a heat storage water tank, an energy storage heat release method and a heat supply system for improving energy storage heat release efficiency, wherein the heat storage and heat release processes of the heat storage water tank are separated, and different requirements are met by using independent circulation modes; in the heat storage stage, hot water enters a heat storage water tank from the lower part, the cold water and the hot water spontaneously flow under the action of the difference of cold water and hot water, and water flows which flow in opposite directions under the action of friction force are entangled to form vortex, so that heat transfer is performed; in the heat release stage, cold and hot water layering is formed by utilizing the density difference of the high-temperature hot water and the low-temperature hot water; and supplying heat to the heat user. When the invention stores heat, the natural circulation mode is utilized to increase the mixing degree of cold and hot water, improve the energy storage efficiency and shorten the heat storage time. When releasing heat, the effect of the cold-hot water layer is ensured by utilizing the difference of the cold-hot water density, heat can be stably supplied to heat users, and meanwhile, the heat storage capacity is improved, so that the heat supply time is prolonged.
Description
Technical Field
The invention belongs to the technical field of energy application of a box body, and particularly relates to a heat storage water tank, an energy storage heat release method and a heat supply system for improving energy storage heat release efficiency.
Background
The box body is equipment for providing energy storage and load regulation service for the heating system, and as the gap exists between the peak and the valley of the power supply, the economic benefit can be improved by utilizing the box body to store heat in the valley period and release heat in the peak period. The cold and hot water of box when heat accumulation is exothermic all coexist in the box inside, but the design of traditional box is more focused on the cold and hot water layering effect when exothermic to this guarantees water supply temperature. Therefore, the mixing degree of cold and hot water is low when the box body stores heat, the heat storage time is prolonged, and the temperature difference in the box body increases the energy storage efficiency and reduces the energy storage efficiency.
Therefore, it is important to develop a method of increasing the mixing degree of cold and hot water in the case of heat storage and maintaining the layering effect of cold and hot water in the case of heat release.
Through the above analysis, the problems and defects existing in the prior art are as follows:
(1) The heat storage device in the prior art has low energy storage efficiency and long heat storage time, so that the heat energy utilization rate is low.
(2) The heat storage device in the prior art has short heat supply time when releasing heat. Making the thermal energy utilization poor.
The meaning of solving the problems and the defects is as follows: the invention aims to thoroughly separate the heat accumulation and heat release of the heat accumulation water tank, and uses two independent circulating systems to meet different requirements.
Disclosure of Invention
In order to overcome the problems in the related art, the embodiment of the invention provides a heat storage water tank, an energy storage heat release method and a heat supply system for improving energy storage heat release efficiency.
The technical scheme is as follows: a method of increasing the energy storage and release efficiency of a thermal storage tank, comprising:
the heat storage and heat release processes of the heat storage water tank are separated, and different requirements are met by using independent circulation modes respectively;
in the heat storage stage, hot water enters a heat storage water tank from the lower part, the cold water and the hot water spontaneously flow under the action of the difference of cold water and hot water, and water flows which flow in opposite directions under the action of friction force are entangled to form vortex, so that heat transfer is performed;
in the heat release stage, cold and hot water layering is formed by utilizing the density difference of the high-temperature hot water and the low-temperature hot water; and supplying heat to the heat user.
In one embodiment, the water is stored during the exothermic phaseThe heat exchange temperature difference in the box is deltat=t 1 -t 2 The method comprises the steps of carrying out a first treatment on the surface of the According to a heat exchange formula Q=KMΔt, the larger the temperature difference is, the larger the heat exchange quantity is, and the higher the heat exchange efficiency is; q-heat exchange amount; k-heat exchange coefficient; mass flow of M-water; delta t-heat exchange temperature difference; t is t 1 High temperature hot water temperature; t is t 2 Low temperature hot water temperature.
In one embodiment, in the heat storage stage, the user side pipeline is closed, the water outlet and the water inlet of the heat storage pipeline are opened, and the heat storage circulating pump is opened; cold water in the box body flows out from a water outlet of the heat storage pipeline above and is sent to the boiler, the heated cold water becomes high-temperature hot water, the high-temperature hot water is sent into the box body by the heat storage circulating water pump, the hot water with smaller density enters the box body from below, the cold water and the hot water spontaneously flow upwards to enable the cold water and the hot water to be mutually mixed to generate vortex, and energy in the high-temperature hot water is transferred to all corners of the box body through the vortex.
In one embodiment, when the low temperature water reaches a certain height in the tank, the low temperature water flows out through the overflow pipe; the sewage in the box body flows out through the sewage outlet.
In one embodiment, in the heat release stage, the water outlet and the water inlet of the heat storage pipeline are closed, and the user side pipeline is opened; hot water flows out of the box body from the upper part and is sent to a hot user, and return water at the user side is evenly sent into the box body by the lower Fang Bushui device in a laminar flow mode, so that an inclined temperature layer is formed.
In one embodiment, when the high temperature hot water reaches a certain height in the tank body, the high temperature hot water flows out through the overflow pipe; the sewage in the box body flows out through the sewage outlet.
The invention further aims to provide a heat storage water tank for improving the heat storage and release efficiency, which is provided with a tank body, wherein one side of the tank body is correspondingly provided with a heat supply pipeline water outlet and a heat supply pipeline water inlet which are matched with each other; the same side of the box body is also provided with a heat storage pipeline water outlet and a heat storage pipeline water inlet which are matched with each other; the upper part of the box body is provided with an overflow pipe, and the lower end of the box body is provided with a sewage outlet.
In one embodiment, the heat supply pipeline water outlet is arranged at the top of the box body, and the heat supply pipeline water inlet is arranged at the bottom of the box body.
In one embodiment, the heat storage pipeline water outlet is arranged at the top of the box body, and the heat storage pipeline water inlet is arranged at the bottom of the box body.
Another object of the present invention is to provide a heating system implementing the method for improving the efficiency of storing and releasing energy of the heat storage tank.
By combining all the technical schemes, the invention has the advantages and positive effects that:
when in heat accumulation, the natural circulation mode is utilized to increase the mixing degree of cold and hot water, improve the energy storage efficiency and shorten the heat accumulation time.
When releasing heat, the effect of the cold-hot water layer is ensured by utilizing the difference of the cold-hot water density, heat can be stably supplied to heat users, and meanwhile, the heat storage capacity is improved, so that the heat supply time is prolonged.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic structural diagram of a heat storage water tank for improving heat storage and release efficiency according to an embodiment of the present invention.
In the figure: 1. a water outlet of the heating pipeline; 2. a water outlet of the heat storage pipeline; 3. a water inlet of the heating pipeline; 4. a heat storage pipeline water inlet; 5. an overflow pipe; 6. a sewage outlet; 7. a box body.
Fig. 2 is a flowchart of a method for improving energy storage and heat release efficiency of a heat storage water tank according to an embodiment of the invention.
FIG. 3 is a schematic diagram showing heat exchange between hot water at high temperature and low temperature according to an embodiment of the present invention; wherein, fig. 3 (a) is an initial state of the high temperature hot water layer and the low temperature hot water layer; FIG. 3 (b) forms a new water layer map; FIG. 3 (c) is a schematic diagram showing the equilibrium of the upper boundary layer water temperature and the upper water temperature and the lower boundary layer water temperature in the shape of the diagonal flow layer.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
The invention provides a method for improving the energy storage and heat release efficiency of a heat storage water tank, which comprises the following steps: the heat storage and heat release processes of the heat storage water tank are separated, and different requirements are met by using independent circulation modes respectively; in the heat storage stage, hot water enters a heat storage water tank from the lower part, the cold water and the hot water spontaneously flow under the action of the difference of cold water and hot water, and water flows which flow in opposite directions under the action of friction force are entangled to form vortex, so that heat transfer is performed;
in the heat release stage, cold and hot water layering is formed by utilizing the density difference of the high-temperature hot water and the low-temperature hot water; and supplying heat to the heat user.
As shown in figure 1, when the heat storage water tank for improving the heat storage and release efficiency stores heat, the natural circulation is utilized to increase the mixing degree of cold water and hot water, so that the energy storage efficiency is improved; when releasing heat, the cold and hot water density difference is utilized to ensure the cold and hot water layering effect and maintain the water supply temperature. When heat accumulation, hot water is respectively injected from the bottom of the box body 7, cold water is discharged from the top of the box body 7, at this time, the cold water and the hot water are mutually mixed to generate vortex due to the physical properties of the cold water and the hot water in the box body 7, and the externally injected energy is quickly transferred to the whole parts of the box body 7, so that the energy storage efficiency can be remarkably improved and the temperature difference inside the box body 7 can be reduced. When releasing heat, the hot water is evenly sucked out from the upper part of the box body 7 to be supplied to the heat user, and meanwhile, backwater at the heat user is evenly fed into the water tank from the bottom of the box body 7 in a laminar flow state, so that the stability of an inclined temperature layer in the box body 7 is ensured, and the cold water and the hot water are layered.
As shown in fig. 2, the method for improving the energy storage and heat release efficiency of the heat storage water tank provided by the embodiment of the invention comprises the following steps:
s101, in the heat storage stage, hot water heated by the electric boiler enters the box body 7 from the water inlet 4 of the heat storage pipeline, and low-temperature water in the water tank flows to the boiler from the water outlet 2 of the heat storage pipeline for heating. When the low-temperature water reaches a certain height in the tank 7, the low-temperature water flows out through the overflow pipe 5. The sewage in the box body 7 flows out through the sewage outlet 6.
S102, in the heat release stage, high-temperature hot water in the box body 7 flows to the user side from the water outlet 1 of the heat supply pipeline, and backwater uniformly enters the water tank from the water inlet 3 of the heat supply pipeline to form an inclined temperature layer so as to weaken heat exchange between the middle bottom and the top in the box body 7. When the high-temperature hot water reaches a certain height in the tank 7, the hot water flows out through the overflow pipe 5. The sewage in the box body 7 flows out through the sewage outlet.
In a preferred embodiment of the invention, the tank 7 closes the user side pipe, opens the heat storage pipe water outlet 2 and the heat storage pipe water inlet 4, and opens the heat storage circulation pump during the heat storage phase. Cold water in the box body 7 flows out from the water outlet 2 of the upper heat storage pipeline and is sent to the boiler, and after being heated, the hot water is sent into the box body 7 by the heat storage circulating water pump, the high-temperature hot water enters the box body 7 from the lower part, the density of the hot water is also greatly different due to different temperatures of the hot water, the hot water with smaller density spontaneously flows upwards to enable the cold water and the hot water to be mutually mixed to generate vortex, the mixing degree of the hot water and the cold water is obviously improved by the vortex, and the energy in the hot water is rapidly transferred to all corners of the box body 7. The high efficiency heat transfer reduces the temperature difference of the box body 7 provided by the invention compared with the traditional water tank in heat storage, and relatively increases the heat storage capacity. Therefore, the box body 7 not only relatively increases the heat storage capacity but also effectively improves the heat storage efficiency by improving the mixing degree of cold and hot water.
In the heat release stage, the box 7 provided by the invention is used for closing the water outlet 2 and the water inlet 4 of the heat storage pipeline and opening the pipeline at the user side. Hot water flows out of the box body from the upper part and is sent to a hot user, and return water at the user side is evenly sent into the box body 7 by the lower Fang Bushui device in a laminar flow mode, so that the stability of an inclined temperature layer is ensured, and the water supply temperature of the box body 7 is maintained.
The technical scheme of the invention is further described below by combining specific principles and embodiments.
In the heat storage stage, hot water enters the heat storage water tank from the lower part, the special limitation of the flow rate and the flow rate is not needed, the cold and hot water can spontaneously flow under the action of the difference of the cold and hot water, and the water flows which are opposite to each other and run under the action of friction force can be entangled to form vortex, so that the heat transfer is accelerated.
Therefore, the flow rate and the flow velocity are not particularly limited, but the purpose of saving the operation cost can be achieved by increasing the temperature of the injected hot water. For example, if the lower part is cooled and heated during heat accumulation, the heat exchange between the cold water and the hot water is slow, and the cold water in the water tank needs to be replaced for the most part because the cold water and the hot water do not flow in a large range; if the water is hot downwards and cold upwards, cold and hot water flows, and convection heat exchange occurs rapidly, so that the same energy can be injected into the water tank through less high-temperature hot water to finish heat accumulation. The running cost is reduced.
As shown in fig. 3, the heat exchange of the high-temperature hot water and the low-temperature hot water is schematically shown. Wherein t is 1 High temperature hot water temperature; t2 low temperature and h thickness of the inclined temperature layer; the initial states of the high temperature hot water layer and the low temperature hot water layer are shown in fig. 3 (a).
A boundary layer is arranged between the hot water, and the high-temperature hot water and the low-temperature hot water on the boundary layer are mixed to form a temperature of
The water layer forms a new interface with the upper and lower water bodies, and the heat conduction and mixing are continued due to the temperature difference to form a new water layer Deltah (initial inclined temperature layer) as shown in FIG. 3 (b), and the temperature of the water layer contacted with the upper interface is +.>
The temperature of the aqueous layer in contact with the lower interface is +.>
The total water layer is thickened and the process is continued until the upper boundary layer and the upper water temperature reach balance in the shape of the diagonal flow layer and the lower boundary layer and the lower water temperature reach balance, as shown in fig. 3 (c).
The water layer with temperature change formed between the high-temperature hot water and the low-temperature hot water is called an inclined temperature layer h. The temperature in the oblique temperature layer rises approximately linearly.
In the prior art, the heat exchange temperature difference in the water tank in the upper heating and lower cooling modes is that
Or->
The heat exchange temperature difference inside the water tank is t 1 -t 2 The method comprises the steps of carrying out a first treatment on the surface of the As can be known from the heat exchange formula q=km Δt, the larger the temperature difference is, the larger the heat exchange amount is, and the higher the heat exchange efficiency is; q-heat exchange amount, K-heat exchange coefficient, M-water mass flow, delta t-heat exchange temperature difference. The heat storage and heat release phases are completely independent, the heat storage efficiency is improved, and the heat release time is prolonged, which is the innovation of the invention.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure should be limited by the attached claims.
Claims (5)
1. The method for improving the energy storage and heat release efficiency of the heat storage water tank is characterized by comprising the following steps of:
the heat storage and heat release processes of the heat storage water tank are separated, and different requirements are met by using independent circulation modes respectively;
in the heat storage stage, hot water enters a heat storage water tank from the lower part, the cold water and the hot water spontaneously flow under the action of the difference of cold water and hot water, and water flows which flow in opposite directions under the action of friction force are entangled to form vortex, so that heat transfer is performed;
in the heat release stage, cold and hot water layering is formed by utilizing the density difference of the high-temperature hot water and the low-temperature hot water; heating the heat user;
in the heat storage stage, closing a user side pipeline, opening a heat storage pipeline water outlet (2) and a heat storage pipeline water inlet (4), and opening a heat storage circulating pump; cold water in the box body (7) flows out from the water outlet (2) of the heat storage pipeline above and is sent to the boiler, the heated cold water becomes high-temperature hot water, the high-temperature hot water is sent into the box body (7) by the heat storage circulating water pump, the high-temperature hot water enters the box body (7) from the lower part, the spontaneous upward flow of the hot water with smaller density enables cold water and hot water to be mutually mixed to generate vortex, and energy in the high-temperature hot water is transferred to all corners of the box body (7) through the vortex.
2. The method for improving energy storage and heat release efficiency of a heat storage water tank according to claim 1, wherein the heat exchange temperature difference inside the heat storage water tank in the heat release stage is Δt=t 1 -t 2 The method comprises the steps of carrying out a first treatment on the surface of the According to a heat exchange formula Q=KMΔt, the larger the temperature difference is, the larger the heat exchange quantity is, and the higher the heat exchange efficiency is; q-heat exchange amount; k-heat exchange coefficient; mass flow of M-water; delta t-heat exchange temperature difference; t is t 1 High temperature hot water temperature; t is t 2 Low temperature hot water temperature.
3. The method for improving the energy storage and heat release efficiency of the heat storage water tank according to claim 1, wherein when the low-temperature water reaches a certain height in the tank body (7), the low-temperature water flows out through the overflow pipe (5); the sewage in the box body (7) flows out through the sewage outlet (6).
4. The method for improving the energy storage and heat release efficiency of the heat storage water tank according to claim 1, wherein in the heat release stage, a water outlet (2) of the heat storage pipeline and a water inlet (4) of the heat storage pipeline are closed, and a user side pipeline is opened; hot water flows out of the box body from the upper part and is sent to a hot user, and return water at the user side is evenly sent into the box body (7) from the lower Fang Bushui device in a laminar flow mode, so that an inclined temperature layer is formed.
5. The method for improving the energy storage and heat release efficiency of the heat storage water tank according to claim 4, wherein when the high-temperature hot water reaches a certain height in the tank body (7), the hot water flows out through the overflow pipe (5); the sewage in the box body (7) flows out through the sewage outlet.
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| CN115218260B (en) * | 2022-09-08 | 2022-12-20 | 四川蜀旺新能源股份有限公司 | Square cabin power supply and heat supply system |
| CN115881320B (en) * | 2022-11-08 | 2024-04-19 | 中国核动力研究设计院 | High-density phase-change heat storage system for buffering and energy storage |
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