Coupling energy storage device based on thermocline energy storage and coil pipe ice storage

Abstract

The utility model provides a coupling energy storage device based on thermocline energy storage and coil pipe ice storage, which comprises an energy storage tank body, and a waterproof layer, a thermal insulation layer and a protective layer are sequentially arranged on the outer side of the energy storage tank body. An accommodating cabin is arranged in the energy storage tank body, an upper water distributor is arranged at the upper end of the accommodating cabin, and the upper water distributor is connected with the upper water opening; a lower water distributor is arranged at the lower end of the accommodating cabin and is connected with a lower water outlet; the upper water opening and the lower water opening are used for being connected with a cold storage system or a hot water system so as to achieve thermocline water cold storage or heat storage. A plurality of ice coil pipes are arranged in the middle of the containing cabin. On the basis of the thermocline cold storage tank, various modes of water cold storage, water heat storage, ice cold storage and the like are achieved through the coupled ice storage system, combined circulation of water cold storage and ice cold storage can be achieved, energy storage density is effectively improved, and energy storage investment and operation cost are reduced.

Description

Technical Field

[0001] The utility model belongs to the field of coupled energy storage devices, and in particular relates to a coupled energy storage device based on thermocline energy storage and coil ice storage. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Conventional water-cooled storage tanks have limited applications due to their small temperature differential and low cold density, resulting in large overall volumes and footprint. This is particularly challenging for compact building environments, both in terms of design rationality and aesthetics. Furthermore, in indirect cooling systems, the heat exchanger causes higher terminal water temperatures, reducing temperature differentials, resulting in larger circulating water volumes and high energy consumption.

[0004] Ice storage is typically installed in underground ice ponds, which have significant height restrictions and a single application. It can only be used for cold storage, and its use is limited by the cold storage rate. This makes it impossible to store cold on demand, and it prevents the full utilization of off-peak electricity to reduce operating costs. Furthermore, ice storage systems are open systems, which can lead to poor water quality and hinder heat exchange. Summary of the Invention

[0005] In order to solve the above problems, the utility model proposes a coupled energy storage device based on inclined temperature layer energy storage and coil ice storage. The utility model is based on the inclined temperature layer cold storage tank, and realizes multiple modes such as water cold storage, water heat storage and ice cold storage through a coupled ice storage system. At the same time, it can also realize a combined cycle of water cold storage and ice cold storage, effectively improving the energy storage density and reducing energy storage investment and operating costs.

[0006] According to some embodiments, the present invention adopts the following technical solutions:

[0007] A coupled energy storage device based on thermocline energy storage and coil ice storage, comprising an energy storage tank body, wherein a waterproof layer, a thermal insulation layer and a protective layer are sequentially arranged on the outer side of the energy storage tank body;

[0008] The energy storage tank body has a storage compartment inside, and an upper water distributor is provided at the upper end of the storage compartment. A portion of the upper water distributor extends to the outside of the energy storage tank body and is connected to the upper water inlet;

[0009] A lower water distributor is provided at the lower end of the storage chamber, a portion of which extends to the outside of the energy storage tank body and is connected to the water outlet;

[0010] The upper and lower water inlets are used to connect to a cold storage system or a hot water system to achieve cold or heat storage of water in the thermoclimatic layer;

[0011] A plurality of ice trays are provided in the middle of the storage chamber, some of which are connected to the bottom or side of the storage chamber via supports, the upper portion of each ice tray is connected to the liquid supply connecting pipe, and the lower portion of each ice tray is connected to the liquid return connecting pipe.

[0012] As an optional embodiment, the upper water distributor is a disc-type water distributor, and a plurality of openings are provided along the extension direction of the upper water distributor, and the openings are upward.

[0013] As an optional embodiment, the lower water distributor is an annular water distributor, and a plurality of openings are provided on the lower water distributor, and the openings are downward.

[0014] As a further embodiment, the sizes of the openings of the upper water distributor and the lower water distributor are smaller than a set value to ensure that the outlet water is in a laminar flow state.

[0015] As an optional embodiment, the top of the energy storage tank body adopts a sealed dome, and the bottom of the energy storage tank body is provided with a sandwich insulation steel plate.

[0016] As an optional embodiment, a bottom support member is provided at the lower end of the ice tray tube, and the side surface of the ice tray tube located at the edge is connected to the energy storage tank body through a side support member.

[0017] As an optional implementation, a certain redundant space is provided between the ice tray and the inner wall of the energy storage tank body.

[0018] As an optional embodiment, the upper end of the energy storage tank body is provided with at least one overflow port, and the bottom of the energy storage tank body is provided with at least one sewage outlet.

[0019] As an optional embodiment, a vapor barrier layer is further provided between the thermal insulation layer and the protective layer of the energy storage tank body.

[0020] As an optional embodiment, ethylene glycol solution is introduced into the liquid return connecting pipe and the liquid supply connecting pipe.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The utility model utilizes a combined cycle to solve the problems of small cold storage temperature difference and low cold storage density in conventional energy storage tanks. By using ice storage to assist water storage, a significant increase in cold storage temperature difference can be achieved, and the configuration ratio of ice storage and water storage can be adjusted as needed, thereby effectively adjusting the cold storage density and cold storage capacity.

[0023] The energy storage tank of the utility model also serves as an ice storage tank, which effectively reduces investment and solves the problems of limited height and large occupation of conventional ice storage tanks.

[0024] The energy storage tank of the utility model can store heat based on the inclined temperature layer, which completely solves the problem that the ice storage system can only be used for cooling, and provides a new idea for the coupled energy supply of multiple technical routes; it can be used for different working conditions such as heat storage, cold storage, ice storage, and even water and ice storage. It requires one-time investment, multiple mode switching, and energy storage on demand, which greatly improves the utilization rate of the system.

[0025] The utility model completely solves the problem of high terminal water supply temperature caused by indirect cooling, effectively reduces the temperature difference, reduces the circulation flow, and reduces the energy consumption of the system.

[0026] The utility model can be used as a constant pressure tank to realize direct cooling, and can also realize indirect cooling according to demand. The cold storage / heat storage / ice storage systems are all closed systems, the water quality can be better maintained, and the operating effect is significantly improved compared with the open system.

[0027] The utility model utilizes the energy storage tank as the ice storage pool, which saves investment and solves many problems of conventional concrete ice storage tanks such as water seepage, leakage, freezing corrosion, and difficulty in sewage discharge; the ice coil uses the tank wall as a stability support, which can greatly increase the installation height, which is conducive to further increasing the storage capacity and reducing the unit cost as a whole.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0030] Figure 1 This is a front view of a coupled energy storage device based on thermocline energy storage and coil ice storage according to an embodiment;

[0031] Figure 2 is a side view of a coupled energy storage device based on thermocline energy storage and coil ice storage according to an embodiment;

[0032] Figure 3 A top view of a coupled energy storage device based on thermocline energy storage and coil ice storage according to an embodiment;

[0033] Figure 4 is a top view of an upper water distributor according to an embodiment;

[0034] Figure 5 The present invention is a partial cross-sectional view of an energy storage tank body according to an embodiment.

[0035] Wherein, A is the diameter of the energy storage tank; H is the height of the energy storage tank;

[0036] a. Water inlet; b. Water outlet; c. Ethylene glycol solution inlet; d. Ethylene glycol solution outlet; e. Inspection port;

[0037] 1. Energy storage tank body; 2. Lower water distributor; 3. Upper water distributor; 4. Liquid supply connecting pipe; 5. Liquid return connecting pipe; 6. Ice tray pipe; 7. Bottom support; 8. Side support;

[0038] 101. Energy storage tank body; 102. Waterproof layer; 103. Insulation layer; 104. Vapor barrier; 105. Protective layer. DETAILED DESCRIPTION

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0043] Example 1

[0044] A coupled energy storage device based on thermocline energy storage and coil ice storage, such as Figure 1-Figure 3 As shown, it includes an energy storage tank body 1 (also referred to as an energy storage tank), and a waterproof layer 102, a heat-insulating layer 103 and a protective layer 105 are sequentially provided on the outer side of the energy storage tank body 1;

[0045] The energy storage tank body 1 has a storage compartment inside, and an upper water distributor 3 is provided at the upper end of the storage compartment. A portion of the upper water distributor 3 extends to the outside of the energy storage tank body 1 and is connected to the upper water inlet a;

[0046] A lower water distributor 2 is provided at the lower end of the storage chamber, a portion of which extends to the outside of the energy storage tank body 1 and is connected to the water outlet b;

[0047] The upper water inlet a and the lower water inlet b are used to connect to the cold storage system or the hot water system to realize cold or heat storage of water in the temperature-slope layer;

[0048] A plurality of ice tray tubes 6 are provided in the middle of the storage chamber, and some of the ice tray tubes 6 are connected to the bottom or side of the storage chamber through supports. The upper part of each ice tray tube 6 is connected to the liquid supply connecting pipe 4, and the lower part of each ice tray tube 6 is connected to the liquid return connecting pipe 5.

[0049] The liquid supply connecting pipe 4 is connected to the ethylene glycol solution inlet c, and the liquid return connecting pipe 5 is connected to the ethylene glycol solution outlet d.

[0050] like Figure 1 As shown, the energy storage tank of this embodiment has a cylindrical or rectangular shape (determined according to the application scenario), a sealed dome is used on the top of the energy storage tank, and a sandwich insulation steel plate is used on the bottom of the energy storage tank.

[0051] Water distributors that are compatible with the shape of the energy storage pipe should be installed at the top and bottom, and the size of the water distributor openings should ensure that the water outlet is in a laminar flow state.

[0052] The upper water distributor 3 has an upward opening, while the lower water distributor 2 has a downward opening to facilitate hot and cold stratification. The upper water distributor 3 and the lower water distributor 2 should be combined on the tank wall to form an upper high-temperature water inlet (i.e., upper water inlet a) and a lower low-temperature water inlet (i.e., lower water inlet b).

[0053] In this embodiment, if Figure 4 As shown, the upper water distributor 3 can be shaped like a mosquito coil, or comprise multiple circular rings with successively larger diameters. The lower water distributor 2 can be a circular ring. This is because the upper portion has more space, making full use of it to improve water distribution efficiency, while the lower portion, where the bottom support member 7 for the ice tray 6 is located, has limited space.

[0054] An ice tray 6 is arranged between the upper water distributor 3 and the lower water distributor 2. The ice tray 6 is mainly subjected to force at the bottom, which is provided by the bottom support 7. The side wall of the energy storage tank is also provided with multiple side supports 8 for supporting and enhancing the stability of the ice tray 6.

[0055] In this embodiment, the energy storage tank body 1 is sprayed with epoxy resin on both sides to improve the anti-corrosion performance during cold storage conditions. The outer side of the tank body is made of high-temperature resistant closed-cell insulation material to ensure that no water vapor penetrates during cold storage conditions, thereby ensuring long-lasting cold and heat preservation effects.

[0056] like Figure 5 As shown, a waterproof layer 102, a heat-insulating layer 103, a vapor barrier layer 104 and a protective layer 105 are sequentially provided on the outer side of the energy storage tank body 1.

[0057] In some embodiments, a space of at least 500 mm is maintained between the ice tray 6 and the wall of the energy storage tank to facilitate manual maintenance. The energy storage tank body 1 is also provided with an inspection port e. The energy storage tank body 1 is also provided with at least a bottom sewage outlet and an upper overflow port.

[0058] The device provided in this embodiment preferentially utilizes conventional units for water cooling during off-peak electricity according to the cooling capacity demand during cold storage. At this time, the cold storage system is connected to the upper and lower water ports of the energy storage tank to realize water cooling in an inclined temperature layer.

[0059] When the cooling capacity is high and water-based cooling cannot meet the required cooling capacity, a combined water-ice cooling mode is used. In this case, conventional chillers are used for water-based cooling, while dual-operation ice-based chillers are used for ice-based cooling, connected to the inlet and outlet of ice coil 6. In this mode, the ratio of cooling to water-based cooling is configured based on the specific cooling requirements, ensuring on-demand cooling.

[0060] Under the heat storage condition, the hot water system is connected to the upper and lower water ports of the energy storage tank to achieve high-temperature heat storage.

[0061] In the energy release condition, the system releases energy through the upper and lower water outlets of the energy storage tank using a water distributor.

[0062] This device can increase the cold storage capacity from 4 / 11℃ (7℃ temperature difference) of conventional cold storage to nearly 0℃ / 11℃ (11℃ temperature difference), which can increase the cold storage capacity by 57% compared with the single water cold storage part. Taking into account the latent heat of ice melting, the cold storage capacity will increase exponentially with less impact on system investment.

[0063] This device is a combination of ice storage and water storage, which solves the problems of single energy storage of ice storage and low energy storage density of water storage, while retaining the water heat storage function, realizing multi-system coupling and multi-working condition application, greatly improving the promotion, applicability and practicality.

[0064] This device has strong application adaptability, and the shape of the energy storage tank can be selected as cylindrical or rectangular according to the application scenario to meet the needs of the scene.

[0065] This device utilizes an energy storage tank as an ice storage pool, saving investment and solving numerous problems associated with conventional concrete ice storage tanks, such as water seepage, leakage, freeze corrosion, and difficulty in drainage. The ice coils 6 utilize the tank wall for stability, significantly increasing installation height, further increasing storage capacity and reducing overall unit cost.

[0066] This embodiment resolves the contradictions between energy storage density, cold storage volume, and system investment in conventional energy storage systems. It enables the sharing of water-cooled, water-heated, and ice-cooled storage systems, effectively increasing energy storage density and reducing energy storage investment and operating costs. This truly enables on-demand energy storage, significantly improving the utilization rate and practical applicability of the energy storage system.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made by those skilled in the art that fall within the spirit and principles of the present invention and do not require creative effort shall be included within the scope of protection of the present invention.

Claims

1. A coupled energy storage device based on thermocline energy storage and coil ice storage, characterized by: It includes an energy storage tank body, and the outer side of the energy storage tank body is sequentially provided with a waterproof layer, a heat-insulating layer and a protective layer; The energy storage tank body has a storage compartment inside, and an upper water distributor is provided at the upper end of the storage compartment. A portion of the upper water distributor extends to the outside of the energy storage tank body and is connected to the upper water inlet; A lower water distributor is provided at the lower end of the storage chamber, a portion of which extends to the outside of the energy storage tank body and is connected to the water outlet; The upper and lower water inlets are used to connect to a cold storage system or a hot water system to achieve cold or heat storage of water in the thermoclimatic layer; A plurality of ice trays are provided in the middle of the storage chamber, some of which are connected to the bottom or side of the storage chamber via supports, the upper portion of each ice tray is connected to the liquid supply connecting pipe, and the lower portion of each ice tray is connected to the liquid return connecting pipe.

2. The coupled energy storage device based on thermocline energy storage and coil ice storage as claimed in claim 1, characterized in that: The upper water distributor is a disc-type water distributor, and a plurality of openings are provided along the extension direction of the upper water distributor, and the openings are upward.

3. The coupled energy storage device based on thermocline energy storage and coil ice storage as claimed in claim 1, characterized in that: The lower water distributor is an annular water distributor, and is provided with a plurality of openings, which are downwardly facing.

4. The coupled energy storage device based on thermocline energy storage and coil ice storage as claimed in claim 3 is characterized in that: The sizes of the openings of the upper water distributor and the lower water distributor are smaller than the set value to ensure that the outlet water is in a laminar flow state.

5. The coupled energy storage device based on thermocline energy storage and coil ice storage as claimed in claim 1, characterized in that: The top of the energy storage tank body adopts a sealed dome, and the bottom of the energy storage tank body is provided with a sandwich type heat-insulating steel plate.

6. The coupled energy storage device based on thermocline energy storage and coil ice storage as claimed in claim 1, characterized in that: The lower end of the ice tray tube is provided with a bottom support piece, and the side surface of the ice tray tube located at the edge is connected to the energy storage tank body through a side support piece.

7. The coupled energy storage device based on thermocline energy storage and coil ice storage as claimed in claim 1, characterized in that: A certain redundant space is provided between the ice coil and the inner wall of the energy storage tank body.

8. The coupled energy storage device based on thermocline energy storage and coil ice storage as claimed in claim 1, characterized in that: The upper end of the energy storage tank body is provided with at least one overflow port, and the bottom of the energy storage tank body is provided with at least one sewage outlet.

9. The coupled energy storage device based on thermocline energy storage and coil ice storage as claimed in claim 1, characterized in that: A vapor barrier layer is further provided between the heat-insulating layer and the protective layer of the energy storage tank body.

10. The coupled energy storage device based on thermocline energy storage and coil ice storage as claimed in claim 1, characterized in that: Ethylene glycol solution is introduced into the liquid return connecting pipe and the liquid supply connecting pipe.

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