Energy storage tank capable of supplying heat in gradient mode

Abstract

The utility model discloses an energy storage tank for gradient heat supply. The energy storage tank comprises a heat preservation water tank; the water inlet pipe is connected with the upper end side wall of the heat-preservation water tank; the water return pipe is connected with the lower-end side wall of the heat-preservation water tank; the water distributors are respectively connected with the water inlet pipe and the water return pipe and are positioned above and below the heat preservation water tank; the high-temperature heat exchange coil pipe is arranged in the upper-layer space of the heat preservation water tank; and the low-temperature heat exchange coil pipe is arranged in the lower-layer space of the heat preservation water tank. According to the utility model, the thermophysical property characteristic that water density is different at different temperatures is utilized to reduce mixing and heat transfer among water at different temperatures, water flows slowly from bottom to top in the cold charging process, and the water flows slowly from top to bottom in the cold releasing process, so that a relatively stable temperature field and a relatively stable velocity field are formed in the energy storage tank; a thermocline layer is formed between the two temperature fields, water is distributed through the water distributor, the thickness of the thermocline layer is effectively reduced, the mixing amount of high-temperature water and low-temperature water is reduced, and energy waste caused by opposite flushing of high-temperature water and low-temperature water is reduced.

Description

Technical Field

[0001] The utility model relates to the field of heating systems, and particularly relates to a heat storage tank for gradient heating. Background Art

[0002] There are obvious differences in the time and intensity of electricity consumption load in China. According to relevant literature statistics, the peak-valley difference of electricity consumption in some cities and regions of China has reached 40% in summer and winter. This not only increases the installed capacity of power generation equipment, but also reduces the average efficiency of power generation equipment, and also poses challenges to the regulation of power generation equipment and the safe operation of the power grid.

[0003] In dealing with the problem of excessive peak power load, relatively effective methods include building new power stations, increasing installed capacity, power rationing, and peak shifting and valley filling.

[0004] Among them, air-conditioning energy storage and heat storage, as an important technical means of peak shifting and valley filling, avoids the initial investment burden brought by building new power stations and increasing installed capacity, and at the same time fundamentally solves the adverse effects of power rationing on users' lives and production processes.

[0005] In air-conditioning energy storage and heat storage, single-tank energy storage is usually adopted. For traditional single-tank energy storage systems, during the processes of cold charging and cold discharging, two water flows at different temperatures are always in contact with each other in the tank, and continuously flow upward with the progress of the energy storage process or continuously flow downward with the progress of the cold discharging process. Inevitably, the two water flows at different temperatures are mixed and heat transferred to each other, resulting in energy waste caused by the counterflow of high and low temperature water, which needs to be improved. Content of the Utility Model

[0006] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a heat storage tank for gradient heating, which has the effect of reducing energy waste.

[0007] The above technical purpose of the utility model is achieved through the following technical solutions: A heat storage tank for gradient heating, comprising:

[0008] A heat preservation water tank, which is arranged in a cylindrical shape and has a closed space inside;

[0009] An inlet pipe, which is connected to the upper side wall of the heat preservation water tank;

[0010] A return pipe, which is connected to the lower side wall of the heat preservation water tank;

[0011] A water distributor, which is respectively connected to the inlet pipe and the return pipe, and is located above and below the heat preservation water tank;

[0012] A high-temperature heat exchange coil, which is arranged in the upper space of the heat preservation water tank;

[0013] The low-temperature heat exchange coil is arranged in the lower space of the heat preservation water tank.

[0014] In a preferred example of the present utility model, it can be further configured that: the water distributor includes a main pipe and a plurality of branch pipes, the main pipe is connected to the water inlet pipe or the water return pipe, the branch pipes are uniformly arranged around the main pipe, and a plurality of spray holes are evenly distributed on the branch pipes.

[0015] In a preferred example of the present utility model, it can be further configured that: the spray holes on the upper water distributor are arranged upward, and the spray holes on the lower water distributor are arranged downward.

[0016] In a preferred example of the present utility model, it can be further configured that: the distance between the spray holes of the branch pipes gradually increases from the inside to the outside.

[0017] In a preferred example of the present utility model, it can be further configured that: a plurality of concentrically arranged connecting pipes are connected between the plurality of branch pipes, and a plurality of through holes are evenly distributed on the connecting pipes.

[0018] In a preferred example of the present utility model, it can be further configured that: a plurality of support sheets are arranged on the inner wall of the heat preservation water tank, the support sheets are arranged in a spiral shape, and are used to be embedded between the pipes of the adjacent two layers of the high-temperature heat exchange coil and the low-temperature heat exchange coil.

[0019] In a preferred example of the present utility model, it can be further configured that: both the high-temperature heat exchange coil and the low-temperature heat exchange coil are copper pipes.

[0020] In a preferred example of the present utility model, it can be further configured that: the heat preservation water tank includes a box body and a pair of end covers, a ring of snap rings are arranged on the end covers, and clamping grooves for the snap rings to be clamped and embedded are arranged at both ends of the box body.

[0021] In summary, the present utility model has the following beneficial effects:

[0022] Utilize the thermal physical property characteristics that the density of water is different at different temperatures to reduce the mixing and heat transfer between waters at different temperatures. During the cold charging process, the water flow slowly flows from bottom to top, and during the cold release process, the water flow slowly flows from top to bottom, so that a relatively stable temperature field and velocity field are formed in the energy storage tank. An inclined temperature layer will be formed between the two temperature fields. By distributing water through the water distributor, the thickness of the inclined temperature layer can be effectively reduced. The inclined temperature layer effectively divides the high-temperature water and the low-temperature water. The thinner the inclined temperature layer, the less the mixing amount of the high-temperature water and the low-temperature water, thereby effectively reducing the waste of energy caused by the counterflow of high and low temperature waters;

[0023] 2. By allowing two water temperatures with a large temperature difference to exist in the same energy storage tank, and then, based on the upper and lower water temperatures of different temperatures, after primary heat exchange, four different temperatures can be output externally from the same energy storage tank, improving the practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of an embodiment;

[0025] Figure 2 is a schematic diagram of the connection relationship of an embodiment;

[0026] Figure 3 is a schematic structural diagram of the water distributor of an embodiment;

[0027] Figure 4 is a schematic structural diagram of the heat preservation water tank of an embodiment.

[0028] Reference numerals: 1, heat preservation water tank; 11, box body; 12, end cover; 13, snap ring; 14, clamping groove; 2, water inlet pipe; 3, water return pipe; 4, water distributor; 41, main pipe; 42, branch pipe; 43, spray hole; 44, connecting pipe; 45, through hole; 5, high-temperature heat exchange coil; 6, low-temperature heat exchange coil; 7, support plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] As Figure 1 , Figure 2 shown, an energy storage tank for gradient heating includes a heat preservation water tank 1, a water inlet pipe 2, a water return pipe 3, a water distributor 4, a high-temperature heat exchange coil 5, and a low-temperature heat exchange coil 6.

[0031] As Figure 1 , Figure 2 shown, the heat preservation water tank 1 is arranged in a cylindrical shape, and the inside is a closed space. One end of the water inlet pipe 2 is connected to the upper side wall of the heat preservation water tank 1, and the other end is connected to the water inlet of the boiler. One end of the water return pipe 3 is connected to the lower side wall of the heat preservation water tank 1, and the other end is connected to the water return port of the boiler.

[0032] As Figure 1 , Figure 2 shown, the water distributor 4 is respectively connected to the water inlet pipe 2 and the water return pipe 3, and is located above and below the heat preservation water tank 1.

[0033] As Figure 1 , Figure 2As shown in the figure, the high-temperature heat exchange coil 5 is arranged in the upper space of the heat preservation water tank 1, and both end positions are used to connect high-heat load devices, such as radiators and other devices. The low-temperature heat exchange coil 6 is arranged in the lower space of the heat preservation water tank 1, and both end positions are used to connect geothermal load devices, such as geothermal and other devices. Among them, both the high-temperature heat exchange coil 5 and the low-temperature heat exchange coil 6 are copper pipes. By utilizing the characteristic of copper with relatively high heat exchange efficiency, energy waste is reduced.

[0034] When the cold water temperature is 4°C, the water density is the largest. When the water temperature is higher than 4°C, the density of water decreases as the water temperature rises. The cold water with a large density is located at the lower part of the heat preservation water tank 1, and the warm water with a small density is located at the upper part of the heat preservation water tank 1.

[0035] During the cold charging process, the water flows slowly from bottom to top, and a relatively stable temperature field and velocity field are formed in the energy storage tank. During the cold discharging process, the water flows slowly from top to bottom, and a relatively stable temperature field and velocity field are formed in the energy storage tank.

[0036] An inclined temperature layer will be formed between the two temperature fields. Through the simulation and verification of fluid mechanics, the water distributors 4 at the top and the water distributors 4 at the bottom are used for water distribution, which can effectively reduce the thickness of the inclined temperature layer. The inclined temperature layer effectively divides the high-temperature water and the low-temperature water. The thinner the inclined temperature layer, the less the mixing amount of the high-temperature water and the low-temperature water, and the less the energy waste caused by the counterflow of the high and low-temperature water.

[0037] Combined with the inlet pressure, flow rate, and water temperature stored in the upper and lower temperature layers, through the design of the water distributors 4 at the top and the water distributors 4 at the bottom, the inclined temperature layer can be controlled within 200 mm, reducing the energy waste caused by the counterflow of the high and low-temperature water. At the same time, two water temperatures with a large temperature difference can exist in the same energy storage tank. Then, according to the water temperatures of the upper and lower different temperatures, after primary heat exchange, four different temperatures can be output from the same energy storage tank.

[0038] Such as Figure 2 、 Figure 3 As shown in the figure, the water distributor 4 includes a main pipe 41 and a plurality of branch pipes 42. The main pipe 41 is connected to the water inlet pipe 2 or the water return pipe 3. The branch pipes 42 are uniformly arranged around the main pipe 41. A number of spray holes 43 are evenly distributed on the branch pipes 42. Among them, the spray holes 43 on the upper water distributor 4 are arranged upward, and the spray holes 43 on the lower water distributor 4 are arranged downward, preventing the occurrence of convection and resulting in the mixing and heat transfer of the water flows of the two temperatures.

[0039] Such as Figure 2 、 Figure 3As shown, the distance between the spray holes 43 of the branch pipe 42 gradually increases from the inside to the outside, so as to ensure the stability of the water flow in each area, thereby realizing stable water distribution. A plurality of connecting pipes 44 are concentrically arranged and connected between the plurality of branch pipes 42, and a plurality of through holes 45 are evenly distributed on the connecting pipes 44, so as to increase the water distribution volume and thus improve the water distribution efficiency.

[0040] As Figure 2 , Figure 4 As shown, a plurality of support pieces 7 are arranged on the inner wall of the heat preservation water tank 1. The support pieces 7 are arranged in a spiral shape and are used to be embedded between the pipes of the adjacent two layers of high-temperature heat exchange coils 5 and low-temperature heat exchange coils 6. Therefore, a structure similar to a threaded fit is formed between the support pieces 7 and the high-temperature heat exchange coils 5 and the low-temperature heat exchange coils 6, realizing the rapid and stable installation of the high-temperature heat exchange coils 5 and the low-temperature heat exchange coils 6, and realizing the support of the high-temperature heat exchange coils 5 and the low-temperature heat exchange coils 6, increasing the stability of the high-temperature heat exchange coils 5 and the low-temperature heat exchange coils 6.

[0041] As Figure 4 As shown, the heat preservation water tank 1 includes a box body 11 and a pair of end covers 12. A clamping ring 13 is arranged on the end cover 12, and clamping grooves 14 for the clamping ring 13 to be clamped and embedded are arranged at both ends of the box body 11. Therefore, by setting the heat preservation water tank 1 installed by clamping, the convenient installation of the internal structure and the later disassembly and maintenance can be realized.

[0042] The specific embodiments are only explanations of the present invention, and they are not limitations to the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions according to needs, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A gradient heating energy storage tank, characterized in that: include: The heat preservation water tank (1) is arranged in a cylindrical shape and has a closed space inside; A water inlet pipe (2) connected to the upper side wall of the thermal insulation water tank (1); A water return pipe (3) connected to the lower side wall of the thermal insulation water tank (1); A water distributor (4), connected to the water inlet pipe (2) and the water return pipe (3), respectively, and located above and below the thermal insulation water tank (1); A high-temperature heat exchange coil (5) is arranged in the upper space of the thermal insulation water tank (1); The low-temperature heat exchange coil (6) is arranged in the lower space of the thermal insulation water tank (1).

2. The energy storage tank with gradient heating according to claim 1, characterized in that: The water distributor (4) comprises a main pipe (41) and a plurality of branch pipes (42); the main pipe (41) is connected to the water inlet pipe (2) or the water return pipe (3); the branch pipes (42) are evenly arranged around the main pipe (41); and a plurality of spray holes (43) are evenly distributed on the branch pipes (42).

3. The energy storage tank with gradient heating according to claim 2 is characterized in that: The spray holes (43) on the water distributor (4) at the upper layer are arranged upward, and the spray holes (43) on the water distributor (4) at the lower layer are arranged downward.

4. The energy storage tank with gradient heating according to claim 2 is characterized in that: The spacing between the spray holes (43) from the inside to the outside of the branch pipe (42) gradually increases.

5. The energy storage tank with gradient heating according to claim 2, characterized in that: A plurality of concentrically arranged connecting pipes (44) are arranged to communicate with the plurality of branch pipes (42), and a plurality of through holes (45) are evenly distributed on the connecting pipes (44).

6. The energy storage tank with gradient heating according to claim 1, characterized in that: The inner wall of the thermal insulation water tank (1) is provided with multiple layers of support sheets (7), the support sheets (7) are arranged in a spiral shape and are used to be embedded between the pipes of two adjacent layers of the high-temperature heat exchange coil (5) and the low-temperature heat exchange coil (6).

7. The energy storage tank with gradient heating according to claim 1, characterized in that: The high-temperature heat exchange coil (5) and the low-temperature heat exchange coil (6) are both copper tubes.

8. The energy storage tank with gradient heating according to claim 1, characterized in that: The thermal insulation water tank (1) comprises a tank body (11) and a pair of end covers (12), wherein the end covers (12) are provided with a circle of snap rings (13), and both ends of the tank body (11) are provided with snap grooves (14) for the snap rings (13) to be snapped and embedded.

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