Water cold / heat storage device and method

Abstract

The invention provides a water body cold / heat storage device and method. The device comprises a cold / heat storage water body, a surrounding bank, a floating body unit, a covering film, a first water inlet and outlet pipe, a second water inlet and outlet pipe, a high-position water distributor and a low-position water distributor. A cold / hot storage water body is formed on the inner side of the surrounding shore; the floating body unit covers the surface of the cold / hot water storage body, and the covering film covers the upper surface of the floating body unit; the floating body unit comprises a water inlet and outlet loading floating block and a plurality of floating body modules, and the water inlet and outlet loading floating block is located in the middle of the floating body unit; the first end of the first water inlet and outlet pipe and the first end of the second water inlet and outlet pipe both penetrate through the water inlet and outlet loading floating block and extend into the cold / hot water storage body, the first end of the first water inlet and outlet pipe is provided with the high-position water distributor, and the first end of the second water inlet and outlet pipe is provided with the low-position water distributor. The method has the technical effects that the design is reasonable, the construction process is simplified, and the construction cost is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of water body heat storage, and particularly relates to a water body cold / heat storage device and method. BACKGROUND

[0002] Water body heat storage technology is a kind of energy storage technology that uses the high specific heat capacity of water to store heat or cold and release it when needed. Water has a large specific heat capacity, and a unit volume of water can store more heat. In addition, water has good heat conduction performance, which facilitates heat transfer and exchange, so that water body heat storage has high heat storage efficiency.

[0003] In related technologies, water body heat storage mainly relies on water as a heat storage medium. Although water has advantages such as low cost and easy access, existing water body heat storage technology is large-scale heat storage tank technology, and there are many related cases at home and abroad. However, due to the high cost of water tank engineering, large-scale water body technology is difficult to promote.

[0004] A Chinese utility model patent with application number 201720277897.1 discloses a solid heat storage electric boiler and a heat storage peak regulation system combined with natural water body across seasons. It discloses that the second inlet and outlet water pipeline of the water body water distributor is installed on the concrete base at the bottom of the water body. The bottom waterproof and anti-seepage membrane of the natural water body needs to be opened and sealed with the concrete base to prevent leakage. Moreover, the concrete base and the bottom are installed with the water distributor, which not only leads to high cost, but also complicates the construction process.

[0005] Therefore, there is an urgent need for a water body cold / heat storage device and method to reduce the engineering cost, simplify the construction process, and avoid opening holes in the waterproof and anti-seepage membrane at the bottom of the water body, thereby ensuring the integrity of the waterproof and anti-seepage membrane at the bottom of the water body and avoiding the generation of seepage points or leakage points. SUMMARY

[0006] The present application aims to at least solve one of the technical problems existing in the prior art, and provides a new technical solution for a water body cold / heat storage device and method.

[0007] According to a first aspect of the present application, a water body cold / heat storage device is provided, comprising:

[0008] a cold / heat storage water body and a surrounding bank, the inner side of the surrounding bank forming the cold / heat storage water body;

[0009] a floating body unit and a film, the floating body unit covering the surface of the cold / heat storage water body, and the upper surface of the floating body unit covering the film; the floating body unit comprises a water inlet and outlet load float and a plurality of floating body modules, the water inlet and outlet load float being located in the middle of the floating body unit, and a plurality of floating body units being distributed along the periphery of the water inlet and outlet load float;

[0010] The first water inlet and outlet pipe and the second water inlet and outlet pipe, the first end of the first water inlet and outlet pipe and the first end of the second water inlet and outlet pipe both pass through the water inlet and outlet load float and extend into the cold / heat water storage body, and the first end of the first water inlet and outlet pipe is provided with the high-level water distributor, and the first end of the second water inlet and outlet pipe is provided with the low-level water distributor; wherein the high-level water distributor is located in the upper region of the cold / heat water storage body, and the low-level water distributor is located in the lower region of the cold / heat water storage body.

[0011] The first water inlet and outlet pipe, the second water inlet and outlet pipe, the high-level water distributor and the low-level water distributor are supported by the buoyancy of the water inlet and outlet load float to float on the surface of the cold / heat water storage body.

[0012] Optionally, the water body cold / heat storage device further comprises exhaust pipes; a plurality of exhaust pipes are arranged on the floating body unit in the vertical direction;

[0013] One end of each of the exhaust pipes extends between the adjacent two floating body modules, and the other end extends through the film to the outside.

[0014] Optionally, the water body cold / heat storage device further comprises a cold / heat source heat exchanger; the second end of the first water inlet and outlet pipe and the second end of the second water inlet and outlet pipe are connected with the cold / heat source heat exchanger;

[0015] The water in the cold / heat water storage body circulates between the cold / heat water storage body and the cold / heat source heat exchanger, so as to heat or cool the water in the cold / heat water storage body through the cold / heat source heat exchanger.

[0016] Optionally, the water body cold / heat storage device further comprises a first water pump and a second water pump;

[0017] The first water pump is arranged on the first water inlet and outlet pipe and close to the cold / heat source heat exchanger; and the second water pump is arranged on the second water inlet and outlet pipe and close to the cold / heat source heat exchanger.

[0018] Optionally, the water body cold / heat storage device further comprises a fixing block;

[0019] The first water inlet and outlet pipe and the second water inlet and outlet pipe are fixed to the surrounding shore through the fixing block.

[0020] The material of the fixing block is concrete or steel frame.

[0021] Optionally, the water body cold / heat storage device further comprises an expansion absorption unit;

[0022] The expansion absorption unit is arranged on the first water inlet and outlet pipe and the second water inlet and outlet pipe, and is used for absorbing the expansion of the pipeline.

[0023] Optionally, the material of the floating body module is any one or more of foam, foamed polyurethane, high-density polyethylene, fiber-reinforced resin-based composite material, plastic light plate, and foamed filling composite material.

[0024] Optionally, the cross-sectional shape of the cold / hot water storage body is an inverted isosceles trapezoid, and the included angle between the oblique side and the base of the trapezoid is 135°-160°.

[0025] Optionally, the shape of the floating body module is a cuboid or a cube, and the thickness is 50mm-1500mm.

[0026] According to a second aspect of the present application, a water body cold / hot storage method is provided, which uses the water body cold / hot storage device according to the first aspect, and comprises the following steps:

[0027] Step S1: according to the demand and capacity of cold / hot users in a region, the type of cold / hot source and the capacity of heat storage and cold storage of the water body cold / hot storage device are designed and planned, and according to the land resources in the region, the water volume and structure form are planned and designed;

[0028] Step S2: the waste heat of circulating water of a thermal power unit or low-price electricity for peak shaving and frequency modulation of the thermal power unit is used as a heat source, the outlet water in the heat storage water body is heated by using a cold / hot source heat exchanger, and the heated water is injected into the upper region of the cold / hot water storage body through the first inlet and outlet water pipe and a high-level water distributor; wherein the outlet water in the cold / hot water storage body comes from the lower region of the cold / hot water storage body.

[0029] Alternatively, the cold source comes from any one or more of an absorption refrigeration unit driven by steam of a thermal power unit, a thermal power or a new energy or a grid power supplied electric compression refrigeration unit, the high-temperature outlet water in the cold / hot water storage body is cooled by the cold / hot source heat exchanger, and the cooled water is injected into the lower region of the cold / hot water storage body through the first inlet and outlet water pipe and the high-level water distributor; the high-temperature outlet water in the cold / hot water storage body comes from the upper region of the cold / hot water storage body.

[0030] The cold / hot water storage body uses a plate heat exchanger to heat the return water of a heat network for external heating in winter, and to cool the return water of an air conditioner for external cooling in summer.

[0031] One technical effect of the present application is that:

[0032] In the embodiment of the present application, the first water inlet and outlet pipe, the second water inlet and outlet pipe, the high water distributor and the low water distributor are supported by the buoyancy of the water inlet and outlet load buoy, and the water inlet and outlet load buoy floats on the surface of the cold / heat water storage body, which not only effectively avoids the installation of the water inlet and outlet pipeline and the water distributor on the bottom of the seawall, but also simplifies the construction process, reduces the construction and equipment costs, and effectively avoids the local hole on the waterproof and impermeable whole film on the bottom of the seawall, thereby avoiding the generation of leakage points on the waterproof and impermeable layer on the bottom of the water body, and having high safety. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A structure schematic view of a water body cold / heat storage device according to an embodiment of the present application;

[0034] Figure 2 A top view of a water body cold / heat storage device according to an embodiment of the present application.

[0035] In the figure: 1, cold / heat water storage body; 2, seawall; 3, floating body unit; 31, water inlet and outlet load buoy; 32, floating body module; 4, film; 5, first water inlet and outlet pipe; 6, second water inlet and outlet pipe; 7, high water distributor; 8, low water distributor; 9, exhaust pipe; 10, cold and heat source heat exchanger; 11, first water pump; 12, second water pump; 13, fixing block; 14, expansion absorption unit; 15, pressure fixing part; 16, waterproof and impermeable layer. DETAILED DESCRIPTION

[0036] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0037] The embodiments of the present application will be described in detail below, examples of which are shown in the accompanying drawings, in which the same or similar components have the same or similar designations throughout. The embodiments described below are exemplary only, and are used to explain the present application, and are not to be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of the present application.

[0038] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise stated. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0039] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0040] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] According to the first aspect of the present application, referring to Figure 1 and Figure 2 , a water body cold / heat storage device is provided, which can solve the sealing and leakage prevention problem of the water inlet and outlet pipe at the bottom of the water body and the waterproof and anti-seepage film at the bottom.

[0042] Specifically, the water body cold / heat storage device comprises:

[0043] a cold / heat storage water body 1 and a surrounding wall 2, the inner side of the surrounding wall 2 forming the cold / heat storage water body 1;

[0044] a floating body unit 3 and a film 4, the floating body unit 3 covering the surface of the cold / heat storage water body 1, and the upper surface of the floating body unit 3 covering the film 4, the film 4 being capable of reducing heat dissipation from the water surface to the outside; the floating body unit 3 comprises a water inlet and outlet load float 31 located at the middle of the floating body unit 3, and a plurality of floating body modules 32 distributed along the periphery of the water inlet and outlet load float 31;

[0045] The first water inlet and outlet pipe 5 and the second water inlet and outlet pipe 6, the first end of the first water inlet and outlet pipe 5 and the first end of the second water inlet and outlet pipe 6 both pass through the water inlet and outlet load float 31 and extend into the cold / heat water storage body 1, and the first end of the first water inlet and outlet pipe 5 is provided with the high-level water distributor 7, and the first end of the second water inlet and outlet pipe 6 is provided with the low-level water distributor 8; wherein, the high-level water distributor 7 is located in the upper region of the cold / heat water storage body 1, the low-level water distributor 8 is located in the lower region of the cold / heat water storage body 1, and the high-level water distributor 7 and the low-level water distributor 8 are used to realize that the water inlet and outlet uniformly and stably flow into or out of the cold / heat water storage body 1, and reduce the influence on the different temperature stratification of the cold / heat water storage body 1 caused by the water inlet and outlet flow;

[0046] The first water inlet and outlet pipe 5, the second water inlet and outlet pipe 6, the high-level water distributor 7 and the low-level water distributor 8 are supported by the buoyancy of the water inlet and outlet load float 31 to float on the surface of the cold / heat water storage body 1.

[0047] In the embodiment of the present application, the first water inlet and outlet pipe 5, the second water inlet and outlet pipe 6, the high-level water distributor 7 and the low-level water distributor 8 are supported by the buoyancy of the water inlet and outlet load float 31, and the water inlet and outlet load float 31 floats on the surface of the cold / heat water storage body 1, which not only effectively avoids the installation of the water inlet and outlet pipe and the water distributor at the bottom of the revetment 2, better simplifies the construction process, reduces the construction and equipment costs, but also effectively avoids the local hole on the overall waterproof and impermeable membrane at the bottom of the revetment 2, better avoids the generation of leakage points on the waterproof and impermeable layer at the bottom of the water body, and has higher safety.

[0048] Illustratively, the surface of the revetment 2 is covered with a waterproof and impermeable layer 16, and the waterproof and impermeable layer 16 is located between the cold / heat water storage body 1 and the revetment to avoid the penetration of the cold / heat water storage body 1 into the revetment 2.

[0049] Optionally, the water body cold / heat storage device further comprises a plurality of exhaust pipes 9 distributed in the vertical direction on the floating body unit 3;

[0050] One end of each of the exhaust pipes 9 extends between the adjacent two floating body modules 32, and the other end extends through the film 4 to the outside.

[0051] In the above embodiment, the exhaust pipe 9 can realize the external exhaust of the moisture and hot air on the surface of the water body, and avoid the local bubbling phenomenon of the film 4 on the upper surface of the floating body unit 3 caused by the expansion of the hot air.

[0052] Optionally, the water body cold / heat storage device further comprises a cold and heat source heat exchanger 10; the second end of the first water inlet and outlet pipe 5 and the second end of the second water inlet and outlet pipe 6 are connected with the cold and heat source heat exchanger 10;

[0053] The water in the cold / hot water storage body 1 is circulated between the cold / hot water storage body 1 and the cold / hot source heat exchanger 10, so as to heat or cool the water in the cold / hot water storage body 1 through the cold / hot source heat exchanger 10.

[0054] In the above embodiment, the cold / hot source heat exchanger 10 can heat or cool the water in the cold / hot water storage body 1, which is simple and convenient to operate.

[0055] For example, the heat source of the cold / hot source heat exchanger 10 is any one or combination of a heat network heater of a thermal power unit, a circulating water waste heat heat pump, an electrically driven heat pump powered by a thermal power or new energy or power grid, an electrode boiler, an electric heating solid / molten salt heat storage device, and a conventional resistance electric boiler.

[0056] The cold source of the cold / hot source heat exchanger 10 is any one or combination of a steam-driven absorption refrigeration unit of a thermal power unit, an electric compression refrigeration unit powered by a thermal power or new energy or power grid.

[0057] For example, the structure of the high-level water distributor 7 and the low-level water distributor 8 is any one or combination of a disc-type flow guide water distributor, an octagonal water distributor, a multi-hole plate / dome plate water distributor, and a low-speed diffusion water distributor; and the material of the high-level water distributor 7 and the low-level water distributor 8 is any one or combination of stainless steel, carbon steel with corrosion-resistant surface treatment, glass steel, and high-density polyethylene.

[0058] Optionally, the water body cold / hot storage device further comprises a first water pump 11 and a second water pump 12.

[0059] The first water pump 11 is arranged in the first water inlet / outlet pipe 5 and close to the cold / hot source heat exchanger 10; and the second water pump 12 is arranged in the second water inlet / outlet pipe 6 and close to the cold / hot source heat exchanger 10. The first water pump 11 and the second water pump 12 are both used to deliver hot water or cold water to the cold / hot source heat exchanger for heat absorption and heat release, so as to realize the heating and cooling process of the cold / hot water storage body 1.

[0060] In the above embodiment, the water inlet / outlet in the first water inlet / outlet pipe 5 realizes the control of water inlet / outlet flow and flow rate by the pressure head provided by the first water pump 11. The water inlet / outlet in the second water inlet / outlet pipe 6 realizes the control of water inlet / outlet flow and flow rate by the pressure head provided by the second water pump 12.

[0061] Optionally, the water body cold / hot storage device further comprises a fixing block 13.

[0062] The first water inlet / outlet pipe 5 and the second water inlet / outlet pipe 6 are fixed to the seawall 2 through the fixing block 13.

[0063] The material of the fixing block 13 is concrete or steel frame.

[0064] In the above embodiment, the first water inlet and outlet pipe 5 and the second water inlet and outlet pipe 6 can be firmly fixed to the seawall 2 by the fixing block 13, and the stability is good.

[0065] Optionally, the water body cold / heat storage device further comprises an expansion absorption unit 14.

[0066] The first water inlet and outlet pipe 5 and the second water inlet and outlet pipe 6 are provided with the expansion absorption unit 14, and the expansion absorption unit 14 is used to absorb the expansion of the pipe.

[0067] In the above embodiment, the expansion absorption unit 14 can better absorb the expansion of the first water inlet and outlet pipe 5 and the second water inlet and outlet pipe 6, and better ensure the safety of the first water inlet and outlet pipe 5 and the second water inlet and outlet pipe 6.

[0068] Illustratively, the expansion absorption unit 14 is any one or combination of expansion absorption elbow, corrugated pipe, flexible pipe and other devices capable of absorbing the expansion of the pipe.

[0069] In one specific embodiment, the water body cold / heat storage device further comprises a pressing fixture 15, and the periphery of the film 4 is fixed to the seawall 2 by the pressing fixture 15.

[0070] Illustratively, the pressing fixture 15 is any one or combination of masonry block, concrete block, steel block, large steel structure or steel pipe or I-beam and other materials, and the pressing fixture 15 is pressed on the position of the film 4 around the seawall 2, and the soil is used to press and fix the film 4.

[0071] Optionally, the material of the floating body module 32 is any one or more of foam, foamed polyurethane, high-density polyethylene, fiber-reinforced resin-based composite material, plastic light plate, foamed filling composite material.

[0072] In the above embodiment, the material of the floating body module 32 is reasonably designed, which can firmly support the first water inlet and outlet pipe 5, the second water inlet and outlet pipe 6 and other components by buoyancy, and the cost is low.

[0073] Illustratively, the surface of the floating body unit 3 is coated with a temperature-resistant film 4, which can withstand the high temperature of the hot water on the surface of the heat storage water body.

[0074] Optionally, the cross-sectional shape of the cold / heat storage water body 1 is an inverted isosceles trapezoid, the included angle between the oblique side and the base side of the trapezoid is 135°-160°, and preferably the horizontal direction long side of the right triangle corresponding to the oblique side is 2 times the length of the vertical direction short side. Illustratively, the inclined surface around the seawall 2 is the inclined surface after the soil is leveled without hardening.

[0075] In the above embodiment, the cold / heat storage can be well achieved by the cold / heat storage water body 1.

[0076] Optionally, the floating body module 32 is cuboid or cubic in shape, and has a thickness of 50mm-1500mm. This can well ensure the strength of the floating body module 32, and also helps to realize the assembly of the floating body unit 3.

[0077] According to a second aspect of the present application, a water body cold / heat storage method is provided, which uses the water body cold / heat storage device as described in the first aspect, and comprises the following steps:

[0078] In step S1, according to the demand and capacity of the cold / heat users in the region, the type of cold / heat source and the capacity of heat storage and cold storage of the water body cold / heat storage device are designed and planned, and according to the land resources in the region, the water body volume and structure form are planned and designed.

[0079] In step S2, referring to Figure 1 , the waste heat of the circulating water of the thermal power unit cycle water heat pump or the low-price electricity heating of the thermal power unit peak shaving and frequency modulation is used as the heat source, the outlet water in the heat storage water body is heated by the cold / heat source heat exchanger 10, and the heated water is injected into the upper region of the cold / heat storage water body 1 through the first inlet / outlet water pipe 5 and the high-level water distributor 7; wherein the outlet water in the cold / heat storage water body 1 comes from the low-level water distributor in the lower region of the cold / heat storage water body 1.

[0080] Alternatively, the cold source comes from any one or more of the steam-driven absorption refrigeration unit of the thermal power unit, the thermal power or new energy or grid power-supplied electric compression refrigeration unit, the cold source cools the high-temperature outlet water in the cold / heat storage water body 1 through the cold / heat source heat exchanger 10, and the cooled water is injected into the lower region of the cold / heat storage water body 1 through the second inlet / outlet water pipe 6 and the low-level water distributor 8; the high-temperature outlet water in the cold / heat storage water body 1 comes from the high-level water distributor in the upper region of the cold / heat storage water body 1.

[0081] In the above embodiment, the cold / heat storage water body 1 uses a plate heat exchanger to heat the heat network return water for external heating in winter, and to cool the air conditioning return water for external cooling in summer.

[0082] In the above embodiment, the water body cold / heat storage method is reasonably arranged, and the water body cold / heat storage method realizes the consumption of the surplus power of the thermal power peak shaving and frequency modulation or the new energy surplus power by controlling the change and adjustment of the heat storage and cold storage capacity in different seasons and working conditions.

[0083] For example, the heat source can also come from any one or combination of new energy power station or grid powered electric driven heat pump, electrode boiler, electric heating solid / molten salt heat storage device, and conventional resistance electric boiler. The heat source heats the outlet water in the cold / hot water body 1 through the cold and heat source heat exchanger 10, and after heating, the outlet water is injected into the upper region of the cold / hot water body 1 through the first inlet and outlet water pipe 5 and the high-level water distributor 7. The outlet water in the cold / hot water body 1 comes from the low-level water distributor 8 in the lower region of the cold / hot water body 1.

[0084] In the embodiments of the present application, the water body cold / hot storage method realizes the consumption of the excess power of the thermal power peak regulation and frequency modulation or new energy by controlling the change and adjustment of the heat storage and cold storage capacity in different seasons and working conditions, thereby realizing the new heat storage and cold storage energy storage adjustment function of responding to the power spot market and the grid peak regulation and frequency modulation signal.

[0085] It can be understood that the above embodiments are only exemplary embodiments adopted for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also considered to be within the protection scope of the present application.

Claims

1. A water body cold / heat storage device, characterized by, The water body cold / hot storage device comprises: a cold / hot water storage body and a surrounding bank, an inner side of the surrounding bank forming the cold / hot water storage body; a floating body unit and a film, the floating body unit covering a surface of the cold / hot water storage body, and an upper surface of the floating body unit covering the film; the floating body unit comprises a water inlet and outlet load float located in a middle part of the floating body unit and a plurality of floating body modules distributed along a periphery of the water inlet and outlet load float; a first water inlet and outlet pipe and a second water inlet and outlet pipe, a first end of the first water inlet and outlet pipe and a first end of the second water inlet and outlet pipe both penetrating through the water inlet and outlet load float and extending into the cold / hot water storage body, and the first end of the first water inlet and outlet pipe being provided with a high-level water distributor and the first end of the second water inlet and outlet pipe being provided with a low-level water distributor; wherein the high-level water distributor is located in an upper region of the cold / hot water storage body and the low-level water distributor is located in a lower region of the cold / hot water storage body; the first water inlet and outlet pipe, the second water inlet and outlet pipe, the high-level water distributor and the low-level water distributor are supported by buoyancy of the water inlet and outlet load float to float on a surface of the cold / hot water storage body.

2. The water mass cold / heat storage device according to claim 1, characterized by The water body cold / hot storage device further comprises exhaust pipes, and a plurality of exhaust pipes are arranged on the floating body unit in a vertical direction; one end of each of the exhaust pipes extends into a space between two adjacent floating body modules, and the other end of each of the exhaust pipes extends to an outside through the film.

3. The water mass cold / heat storage device according to claim 1, characterized by The water body cold / hot storage device further comprises a cold and heat source heat exchanger, and a second end of the first water inlet and outlet pipe and a second end of the second water inlet and outlet pipe are connected to the cold and heat source heat exchanger; water in the cold / hot water storage body circulates between the cold / hot water storage body and the cold and heat source heat exchanger, so that the water in the cold / hot water storage body is heated or cooled by the cold and heat source heat exchanger.

4. The water mass cold / heat storage device according to claim 3, characterized by The water body cold / hot storage device further comprises a first water pump and a second water pump; the first water pump is arranged on the first water inlet and outlet pipe and close to the cold and heat source heat exchanger, and the second water pump is arranged on the second water inlet and outlet pipe and close to the cold and heat source heat exchanger.

5. The water mass cold / heat storage device according to claim 4, wherein The water body cold / hot storage device further comprises a fixing block; the first water inlet and outlet pipe and the second water inlet and outlet pipe are fixed to the surrounding bank by the fixing block. The fixing block is made of concrete or steel frame.

6. The water mass cold / heat storage device according to claim 1, wherein The water body cold / hot storage device further comprises an expansion absorption unit; the expansion absorption unit is arranged on the first water inlet and outlet pipe and the second water inlet and outlet pipe, and the expansion absorption unit is used for absorbing expansion of the pipes.

7. The water mass thermal storage / heat plant of claim 1 wherein, The floating body module is made of any one or more of foam, foamed polyurethane, high-density polyethylene, fiber reinforced resin-based composite material, plastic light plate material and foamed filling composite material.

8. The water mass thermal storage / heat plant of claim 1 wherein, A cross-sectional shape of the cold / hot water storage body is an inverted isosceles trapezoid, and an included angle between an oblique side and a base of the trapezoid is 135°-160°.

9. The water mass cold / heat storage device according to claim 1, wherein The floating body module is in a shape of a cuboid or a square, and a thickness of the floating body module is 50mm-1500mm.

10. A water body cold / heat storage method, characterized by, The water body cold / hot storage device is used in a method comprising the following steps: S1, according to a demand and a capacity of a cold and heat user in a region, designing and planning a cold and heat source type and a capacity of heat storage and cold storage of the water body cold / hot storage device, and according to land resources in the region, planning and designing a water volume and a structure form of the water body cold / hot storage device. Step S2, using the waste heat of thermal power unit circulating water heat pump or thermal power unit peak shaving and frequency modulation low price electricity heating as heat source, heating the outlet water in the cold / heat storage water body by using cold and heat source heat exchanger, and injecting the heated water into the upper area of the cold / heat storage water body through the first inlet and outlet water pipe and high-level water distributor; wherein the outlet water in the cold / heat storage water body comes from the low-level water distributor in the lower area of the cold / heat storage water body; Or, the cold source comes from any one or more of the steam-driven absorption refrigeration unit of thermal power unit, thermal power or new energy or grid power supply electric compression refrigeration unit, and the high-temperature outlet water in the cold / heat storage water body is cooled by the cold and heat source heat exchanger, and after cooling, it is injected into the lower area of the cold / heat storage water body through the second inlet and outlet water pipe and low-level water distributor; the high-temperature outlet water in the cold / heat storage water body comes from the high-level water distributor in the upper area of the cold / heat storage water body; Wherein, the cold / heat storage water body uses plate heat exchanger to heat the heat network return water for external heating in winter; and to cool the air conditioning return water to realize external cooling in summer.

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