A heat storage module, a modular solid-liquid heat storage system and a working method thereof

Abstract

The application belongs to the technical field of energy storage, and particularly relates to a heat storage module, a modular solid-liquid heat storage system and a working method thereof. The heat storage module comprises a module shell, the upper and lower ends of the module shell are respectively provided with a module inlet and a module outlet, and the inner cavity is filled with solid heat storage particles. The diameter of the solid heat storage particles presents an increasing trend from bottom to top. The modular solid-liquid heat storage system comprises the heat storage module, the module outlet, a circulating pump and the module inlet are sequentially connected, a heat releasing device and a heating device are sequentially arranged on a conveying pipeline, and a heat releasing bypass pipeline and a heating bypass pipeline are sequentially arranged on the conveying pipeline. A bypass valve is arranged on each of the two bypass pipelines, and valves are arranged on the inlets and outlets of the heat releasing device and the heating device. The heat storage module has high energy storage efficiency. The modular solid-liquid heat storage system can convert electric energy into heat energy and store the heat energy in the heat storage device during a new energy peak period, and can continuously output the heat energy during a new energy valley period. Therefore, the application can effectively consume new energy power.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage, and particularly relates to a heat storage module, a modular solid-liquid heat storage system and a working method thereof. BACKGROUND

[0002] Accelerating the development of renewable energy and implementing renewable energy replacement is a major measure to promote energy revolution and build a clean, low-carbon, safe and efficient energy system. Renewable energy has entered a new stage of development. The installed capacity of distributed renewable energy is increasing rapidly, but the grid accommodation capacity has become a constraint to the development of distributed renewable energy in many places. Therefore, the principle of "self-generation and self-use, and surplus power on the grid" has become a key development principle for distributed renewable energy. Distributed new energy shows obvious instability and volatility. Energy storage is an important means to suppress the volatility of distributed new energy. How to store and utilize new energy is one of the urgent problems encountered by those skilled in the art. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a heat storage module, a modular solid-liquid heat storage system and a working method thereof. The heat storage module designed by the present application has high energy storage efficiency. The modular solid-liquid heat storage system designed by the present application can convert electrical energy into thermal energy and store it in the heat storage device during the peak period of new energy, and continuously output thermal energy during the valley period of new energy. Therefore, the present application can effectively accommodate new energy power.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] A heat storage module comprises a module shell, the upper end and the lower end of the module shell are respectively provided with a module inlet and a module outlet, and the inner cavity of the module shell is filled with solid heat storage particles; from the bottom of the module shell upwards, the diameter of the solid heat storage particles shows an increasing trend.

[0006] Preferably, from the bottom of the inner cavity of the module shell upwards, the growth rate of the diameter of the solid heat storage particles is 1.5-3.

[0007] Preferably, the diameter of the solid heat storage particles ranges from 8mm to 32mm.

[0008] Preferably, the solid heat storage particles are distributed in a multi-layer arrangement in the inner cavity of the module shell. When the height h of the inner cavity of the module shell is less than or equal to 2m, the solid heat storage particles are arranged in two layers; when 2

[0009] Preferably, the solid heat storage particles include large-diameter solid heat storage particles, medium-diameter solid heat storage particles and small-diameter solid heat storage particles, wherein the large-diameter solid heat storage particles have a diameter of 24-32 mm, the medium-diameter solid heat storage particles have a diameter of 16-24 mm, and the small-diameter solid heat storage particles have a diameter of 8-16 mm;

[0010] When the height h of the module shell cavity is ≤2 m, the upper layer of solid heat storage particles uses large-diameter solid heat storage particles, and the lower layer of solid heat storage particles uses medium-diameter solid heat storage particles;

[0011] When 2

[0012] When h>4 m, the upper layer of solid heat storage particles uses large-diameter solid heat storage particles, the lower layer of solid heat storage particles uses small-diameter solid heat storage particles, and each layer between the upper and lower layers of solid heat storage particles uses medium-diameter solid heat storage particles.

[0013] Preferably, the upper end of the module shell cavity is provided with an upper sealing plate, and the lower end is provided with a lower sealing plate, and the solid heat storage particles are filled between the upper sealing plate and the lower sealing plate, and the upper sealing plate and the lower sealing plate are both provided with through holes for fluid flow.

[0014] The application also provides a modular solid-liquid heat storage system, which comprises a heat storage device, wherein the heat storage device comprises the heat storage module as described above, the module outlet of the module shell is connected with a circulating pump, the outlet of the circulating pump is connected with the module inlet through a conveying pipeline, the conveying pipeline is sequentially provided with a heat releasing device and a heating device, the conveying pipeline is connected with a heat releasing bypass pipeline in parallel with the heat releasing device and a heating bypass pipeline in parallel with the heating device, the heat releasing bypass pipeline is provided with a heat releasing bypass valve, the heating bypass pipeline is provided with a heating bypass valve, the inlet of the heat releasing device is provided with a heat releasing inlet valve, and the outlet is provided with a heat releasing outlet valve, the inlet of the heating device is provided with a heating inlet valve and a heating outlet valve.

[0015] The working method of the modular solid-liquid heat storage system as described above comprises the following processes:

[0016] The heat storage process: closing the heat release inlet valve, the heat release outlet valve and the heating bypass valve, opening the heating inlet valve, the heating outlet valve and the heat release bypass valve, starting the circulating pump and the heating device; the liquid heat storage medium flows from the module outlet of the heat storage module into the heating device through the circulating pump, the liquid heat storage medium heated by the heating device returns to the heat storage module through the module inlet, the liquid heat storage medium flowing into the heat storage module transfers heat to the solid heat storage particles; in the heat storage process, the flow of the liquid heat storage medium is controlled by adjusting the rotating speed of the circulating pump, so that the outlet liquid heat storage medium temperature of the heating device reaches the set value; when the circulating pump inlet medium temperature reaches the first set value, the heating inlet valve, the heating outlet valve and the heat release bypass valve are closed, the circulating pump and the heating device are stopped, and the heat storage process is completed.

[0017] The heat release process: opening the heat release inlet valve, the heat release outlet valve and the heating bypass valve, closing the heating inlet valve, the heating outlet valve and the heat release bypass valve, starting the circulating pump and the heat release device; the liquid heat storage medium flows from the module outlet of the heat storage module into the heat release device through the circulating pump, the liquid heat storage medium cooled by the heat release device returns to the heat storage module through the module inlet, the liquid heat storage medium flowing into the heat storage module absorbs heat from the solid heat storage particles; in the heat release process, the flow of the liquid heat storage medium is controlled by adjusting the rotating speed of the circulating pump, so that the outlet liquid heat storage medium temperature of the heat release device reaches the set value; when the circulating pump inlet medium temperature reaches the second set value, the heat release inlet valve, the heat release outlet valve and the heating bypass valve are closed, the circulating pump and the heat release device are stopped, and the heat release process is completed.

[0018] Preferably, the heat storage device comprises two or more heat storage modules arranged side by side, the outlet of the circulating pump is connected with the module inlet of each module inlet through a conveying pipeline, and the module inlets of all heat storage modules are provided with module inlet valves; the inlet of the circulating pump is connected with the module outlet of each module inlet, and the module outlet of each module inlet is provided with a module outlet valve.

[0019] The working method of the modular solid-liquid heat storage system as described above comprises the following processes:

[0020] The heat storage process: the heat release inlet valve, the heat release outlet valve and the heating bypass valve are closed, the heating inlet valve, the heating outlet valve and the heat release bypass valve are opened, the circulating pump and the heating device are started, the module inlet valve and the module outlet valve of the first heat storage module of the heat storage device are opened, and the module inlet valves and the module outlet valves of other heat storage modules are closed; the liquid heat storage medium flows through the circulating pump from the first heat storage module into the heating device, the liquid heat storage medium is heated by the heating device and then returns to the first heat storage module, and the liquid heat storage medium flowing into the first heat storage module transfers heat to the solid heat storage particles; in this process, the flow of the liquid heat storage medium is controlled by adjusting the rotating speed of the circulating pump, so that the outlet liquid heat storage medium temperature of the heating device reaches the set value; when the circulating pump inlet medium temperature reaches the first set value, the module inlet valve and the module outlet valve of the second heat storage module of the heat storage device are opened; when the outlet medium temperature of the second heat storage module reaches the third set value, the module inlet valve and the module outlet valve of the second heat storage module are closed; the cycle is repeated until all the heat storage modules of the heat storage device complete heat storage, then the heating inlet valve, the heating outlet valve and the heat release bypass valve are closed, the circulating pump and the heating device are stopped, and the heat storage process is completed.

[0021] The heat release process: the heat release inlet valve, the heat release outlet valve and the heating bypass valve are opened, the heating inlet valve, the heating outlet valve and the heat release bypass valve are closed, the circulating pump and the heat release device are started, the module inlet valve and the module outlet valve of the first heat storage module of the heat storage device are opened, and the module inlet valves and the module outlet valves of other heat storage modules are closed; the liquid heat storage medium flows through the circulating pump from the first heat storage module into the heat release device, the liquid heat storage medium is cooled by the heat release device and then returns to the first heat storage module, and absorbs heat from the solid heat storage particles; in this process, the flow of the liquid heat storage medium is controlled by adjusting the rotating speed of the circulating pump, so that the outlet liquid heat storage medium temperature of the heat release device reaches the set value; when the circulating pump inlet medium temperature reaches the second set value, the module inlet valve and the module outlet valve of the second heat storage module of the heat storage device are opened; when the outlet medium temperature of the second heat storage module reaches the fourth set value, the module inlet valve and the module outlet valve of the second heat storage module are closed; the cycle is repeated until all the heat storage modules of the heat storage device complete heat release, then the heat release inlet valve, the heat release outlet valve and the heating bypass valve are closed, the circulating pump and the heat release device are stopped, and the heat release process is completed.

[0022] The present application has the following beneficial effects:

[0023] In the heat storage module, the diameters of the solid heat storage particles increase from the bottom of the module shell upwards, so the specific surface area (i.e. heat exchange area) of the solid heat storage particles in the upper part is relatively small, the gap between the particles is relatively large, and the flow resistance of the liquid heat storage medium is relatively small; the specific surface area (i.e. heat exchange area) of the solid heat storage particles increases downwards, the gap between the particles is relatively small, and the flow resistance of the liquid heat storage medium is relatively large. When the heat storage module is used, the heated liquid heat storage medium is introduced from the module inlet in the upper part, the temperature of the liquid heat storage medium is high when it just enters the heat storage module, and the temperature decreases downwards, and the specific surface area (i.e. heat exchange area) of the solid heat storage particles in the upper part is relatively small, the gap between the particles is relatively large, and the flow resistance of the liquid heat storage medium is relatively small, so the solid heat storage particles in the upper part cannot absorb too much heat, the temperature of the liquid heat storage medium does not decrease too fast, and the liquid heat storage medium can flow downwards fast, so the temperature of the solid heat storage particles in the upper part is prevented from being too high; the specific surface area (i.e. heat exchange area) of the solid heat storage particles is larger and larger downwards, the gap between the particles is relatively large, and the flow resistance of the liquid heat storage medium is relatively large, so the heat absorption capacity of the solid heat storage particles is stronger and stronger, and the flow speed of the liquid heat storage medium is lower, which is beneficial to the sufficient heat exchange between the liquid heat storage medium and the solid heat storage particles. Therefore, the heat storage module can ensure that the solid heat storage particles at different heights can absorb the heat in the liquid heat storage medium, so that the energy storage efficiency of the heat storage module is high, and the flow speed of the liquid heat storage medium in the heat storage module is from fast to slow, and the heat storage speed of the heat storage module is faster than that of the heat storage module with all small-diameter solid heat storage particles.

[0024] In the modular solid-liquid heat storage system, the liquid heat storage medium in the heat storage module can be pumped out by the circulating pump, the heat in the liquid heat storage medium in the heat storage module can be released by the heat releasing device, the low-temperature liquid heat storage medium after the heat is released in the heat storage module can be heated by the heating device, the heat releasing bypass pipeline and the heating bypass pipeline are connected on the conveying pipeline connected with the outlet of the circulating pump, so that the liquid heat storage medium can flow in the outlet direction of the circulating pump, pass through the valve and the pipe cutting, and realize the heat storage and heat release process, and the process can be completed by only one circulating pump without changing the rotation direction, so that the use amount of the pump is reduced, and the equipment investment is reduced. In the peak period of new energy, the electric energy is converted into heat energy and stored in the heat storage device, and in the valley period of new energy, the heat energy is continuously output, so that the new energy power can be effectively consumed. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0026] Figure 1 The system schematic diagram of the modular solid-liquid heat storage system in the embodiments of the present application;

[0027] Figure 2 The elevation schematic diagram of a single heat storage module of the heat storage device in the embodiments of the present application;

[0028] Figure 3 The cross-sectional schematic diagram of Figure 2 .

[0029] In the drawings, 1 is a heat storage device, 1-1 is a module inlet valve, 1-2 is a module outlet valve, 2 is a circulating pump, 3 is a heat releasing device, 3-1 is a heat releasing inlet valve, 3-2 is a heat releasing outlet valve, 4 is a heating device, 4-1 is a heating inlet valve, 4-2 is a heating outlet valve, 5 is a heat releasing bypass valve, 6 is a heating bypass valve, 7 is a heat storage module, 7-1 is a module inlet, 7-2 is a module shell, 7-3 is an upper sealing plate, 7-4 is a large-diameter solid heat storage particle, 7-5 is a medium-diameter solid heat storage particle, 7-6 is a small-diameter solid heat storage particle, 7-7 is a lower sealing plate, 7-8 is a module outlet, 7-9 is a heat preservation layer, 8 is a heating bypass pipeline, 9 is a heat releasing bypass pipeline, 10 is a conveying pipeline, 11 is a buffer distribution chamber, and 12 is a buffer chamber. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0031] Reference is made to Figure 2The heat storage module of the embodiment comprises a module shell 7-2, the upper end and the lower end of the module shell 7-2 are respectively provided with a module inlet 7-1 and a module outlet 7-8, and the inner cavity of the module shell 7-2 is filled with solid heat storage particles; from the bottom of the module shell 7-2 upwards, the diameter of the solid heat storage particles shows a trend of increasing. In use of the heat storage module, the liquid heat storage medium is sent into the inner cavity of the module shell 7-2 from the module inlet 7-1, so that the solid heat storage particles and the liquid heat storage medium (such as molten salt, heat conducting oil or liquid metal) are heat exchanged, when the temperature of the solid heat storage particles is relatively low and the temperature of the liquid heat storage medium is relatively high, the heat storage module serves as a heat storage structure; and when the temperature of the solid heat storage particles is relatively high and the temperature of the liquid heat storage medium is relatively low, the heat storage module serves as a heat release structure. The solid heat storage particles can be, for example, magnesium oxide particles or silicon oxide particles, which are given as examples in the embodiment of the present application and are not limited in particular, and can be selected according to actual needs by those skilled in the art.

[0032] As a preferred embodiment of the present application, on the basis of the above embodiment, in order to ensure the heat exchange efficiency of the heat storage module and the relative uniformity of the overall temperature distribution, in the embodiment, from the bottom of the inner cavity of the module shell 7-2 upwards, the growth rate of the diameter of the solid heat storage particles is controlled to be 1.5-3.

[0033] As a preferred embodiment of the present application, in the embodiment, the solid heat storage particles can have a diameter in the range of 8-32 mm. The solid heat storage particles with such a particle size have sufficient strength and are not easy to break when storing and releasing heat.

[0034] As a further optional solution of the above embodiment, in the embodiment, the solid heat storage particles are distributed in a multi-layer arrangement in the inner cavity of the module shell 7-2, wherein when the height h of the inner cavity of the module shell 7-2 is ≤2 m, the solid heat storage particles are arranged in two layers; when 2

[0035] As a further optional solution of the above embodiment, referring to Figure 2 and Figure 3 In the embodiment, the length a of the heat storage module is 1-1.5 times the width b, i.e. a=(1-1.5)b, and the height h of the heat storage module is 2-4 times the length a of the module, i.e. h=(2-4)a. The heat storage module designed in this way is tall and slim, and in combination with the multi-layer and multi-diameter solid heat storage material, the heat exchange time and space of the liquid heat storage material and the solid heat storage material can be effectively improved, and the heat storage uniformity of the solid-liquid two-phase material can be ensured.

[0036] As a preferred scheme of the above embodiment, in the embodiment, the solid heat storage particles are divided into large-diameter solid heat storage particles 7-4, medium-diameter solid heat storage particles 7-5 and small-diameter solid heat storage particles 7-6, wherein the diameter of the large-diameter solid heat storage particles 7-4 is 24-32 mm, the diameter of the medium-diameter solid heat storage particles 7-5 is 16-24 mm, and the diameter of the small-diameter solid heat storage particles 7-6 is 8-16 mm; when the height h of the inner cavity of the module shell 7-2 is ≤2 m, the solid heat storage particles in the upper layer are the large-diameter solid heat storage particles 7-4, and the solid heat storage particles in the lower layer are the medium-diameter solid heat storage particles 7-5; when 2

[0037] As a preferred scheme of the present application, in the embodiment, the upper end of the inner cavity of the module shell 7-2 is provided with an upper sealing plate 7-3, and the lower end is provided with a lower sealing plate 7-7, the solid heat storage particles are filled between the upper sealing plate 7-3 and the lower sealing plate 7-7, and the solid heat storage particles are positioned by the upper sealing plate 7-3 and the lower sealing plate 7-7, and the upper sealing plate 7-3 and the lower sealing plate 7-7 are both provided with through holes for fluid flow. Among them, a certain distance is left between the upper sealing plate 7-3 and the top of the inner cavity of the module shell 7-2, which can form a buffer distribution chamber 12 between the upper sealing plate 7-3 and the top of the inner cavity of the module shell 7-2. The buffer distribution chamber 12 can temporarily store the liquid heat storage medium flowing into the inner cavity of the module shell 7-2, and at the same time, uniformly distribute the liquid heat storage medium through the uniformly arranged through holes on the surface, so that the liquid heat storage medium can be uniformly distributed in the cross-sectional direction of the module shell 7-2, which is beneficial to improve the heat exchange efficiency of the heat storage module of the embodiment. A certain distance is left between the lower sealing plate 7-7 and the bottom of the inner cavity of the module shell 7-2, which can form a buffer chamber 13 between the lower sealing plate 7-7 and the bottom of the inner cavity of the module shell 7-2. A certain volume of liquid heat storage medium can be temporarily stored in the buffer chamber 13 to ensure that the liquid heat storage medium can continuously flow out from the module outlet 7-8.

[0038] As a preferred scheme of the present application, in the embodiment, a heat preservation layer 7-9 is arranged outside the module shell 7-2, or the module shell 7-2 is directly made of heat preservation material.

[0039] As Figure 1As shown, the modular solid-liquid heat storage system of the embodiment includes a heat storage device 1, which comprises the heat storage module 7 of the application as described above. The module outlet 7-8 of the module housing 7-2 is connected with a circulating pump 2. The outlet of the circulating pump 2 is connected with the module inlet 7-1 through a conveying pipeline 10. The conveying pipeline 10 is sequentially provided with a heat releasing device 3 and a heating device 4. The conveying pipeline 10 is connected with a heat releasing bypass pipeline 9 in parallel with the heat releasing device 3 and a heating bypass pipeline 8 in parallel with the heating device 4. The heat releasing bypass pipeline 9 is provided with a heat releasing bypass valve 5. The heating bypass pipeline 8 is provided with a heating bypass valve 6. The inlet of the heat releasing device 3 is provided with a heat releasing inlet valve 3-1, and the outlet is provided with a heat releasing outlet valve 3-2. The inlet of the heating device 4 is provided with a heating inlet valve 4-1 and a heating outlet valve 4-2.

[0040] The working method of the modular solid-liquid heat storage system of the above embodiment includes the following processes:

[0041] The heat storage process: the heat releasing inlet valve 3-1, the heat releasing outlet valve 3-2 and the heating bypass valve 6 are closed, the heating inlet valve 4-1, the heating outlet valve 4-2 and the heat releasing bypass valve 5 are opened, and the circulating pump 2 and the heating device 4 are started. The liquid heat storage medium flows from the module outlet 7-8 of the heat storage module 7 into the heating device 4 through the circulating pump 2. The liquid heat storage medium is heated by the heating device 4 and then returns to the heat storage module 7 through the module inlet 7-1. The liquid heat storage medium flowing into the heat storage module 7 transfers heat to the solid heat storage particles. During the heat storage process, the flow rate of the liquid heat storage medium is controlled by adjusting the rotating speed of the circulating pump 2, so that the outlet liquid heat storage medium temperature of the heating device 4 reaches the set value. When the inlet medium temperature of the circulating pump 2 reaches the first set value, the heating inlet valve 4-1, the heating outlet valve 4-2 and the heat releasing bypass valve 5 are closed, the circulating pump 2 and the heating device 4 are stopped, and the heat storage process is completed.

[0042] The heat releasing process: the heat releasing inlet valve 3-1, the heat releasing outlet valve 3-2 and the heating bypass valve 6 are opened, the heating inlet valve 4-1, the heating outlet valve 4-2 and the heat releasing bypass valve 5 are closed, and the circulating pump 2 and the heat releasing device 3 are started. The liquid heat storage medium flows from the module outlet 7-8 of the heat storage module 7 into the heat releasing device 3 through the circulating pump 2. The liquid heat storage medium is cooled by the heat releasing device 3 and then returns to the heat storage module 7 through the module inlet 7-1. The liquid heat storage medium flowing into the heat storage module 7 absorbs heat from the solid heat storage particles. During the heat releasing process, the flow rate of the liquid heat storage medium is controlled by adjusting the rotating speed of the circulating pump 2, so that the outlet liquid heat storage medium temperature of the heat releasing device 3 reaches the set value. When the inlet medium temperature of the circulating pump 2 reaches the second set value, the heat releasing inlet valve 3-1, the heat releasing outlet valve 3-2 and the heating bypass valve 6 are closed, the circulating pump 2 and the heat releasing device 3 are stopped, and the heat releasing process is completed.

[0043] As a preferred scheme of the present application, on the basis of the above-mentioned embodiment, the heat storage device 1 in the present embodiment is provided with two or more heat storage modules 7 arranged in parallel, so that the outlet of the circulating pump 2 is connected with the module inlet 7-1 of each module inlet 7-1 through the conveying pipeline 10, and the module inlet 7-1 of all the heat storage modules 7 is provided with a module inlet valve 1-1; the inlet of the circulating pump 2 is connected with the module outlet 7-8 of each module inlet 7-1, and the module outlet 7-8 of each module inlet 7-1 is provided with a module outlet valve 1-2.

[0044] The working method of the modular solid-liquid heat storage system in the above-mentioned embodiment comprises the following processes:

[0045] The heat storage process: the heat release inlet valve 3-1, the heat release outlet valve 3-2 and the heating bypass valve 6 are closed, the heating inlet valve 4-1, the heating outlet valve 4-2 and the heat release bypass valve 5 are opened, the circulating pump 2 and the heating device 4 are started, the module inlet valve 1-1 and the module outlet valve 1-2 of the first heat storage module of the heat storage device 1 are opened, and the module inlet valves and the module outlet valves of other heat storage modules are closed; the liquid heat storage medium flows from the first heat storage module into the heating device 4 through the circulating pump 2, the liquid heat storage medium is heated by the heating device 4 and then returns to the first heat storage module, the liquid heat storage medium flowing into the first heat storage module transfers heat to the solid heat storage particles; in this process, the flow rate of the liquid heat storage medium is controlled by adjusting the rotating speed of the circulating pump 2, so that the outlet liquid heat storage medium temperature of the heating device 4 reaches a set value; when the inlet medium temperature of the circulating pump 2 reaches a first set value, the module inlet valve and the module outlet valve of the second heat storage module of the heat storage device 1 are opened; when the outlet medium temperature of the second heat storage module reaches a third set value, the module inlet valve and the module outlet valve of the second heat storage module are closed; the above processes are repeated until all the heat storage modules of the heat storage device 1 complete heat storage, then the heating inlet valve 4-1, the heating outlet valve 4-2 and the heat release bypass valve 5 are closed, the circulating pump 2 and the heating device 4 are stopped, and the heat storage process is completed;

[0046] Heat releasing process: open the heat releasing inlet valve 3-1, the heat releasing outlet valve 3-2, the heating bypass valve 6, close the heating inlet valve 4-1, the heating outlet valve 4-2, the heat releasing bypass valve 5, start the circulating pump 2 and the heat releasing device 3; open the module inlet valve 1-1 and the module outlet valve 1-2 of the first heat storage module of the heat storage device 1, close the module inlet valves and the module outlet valves of other heat storage modules; the liquid heat storage medium flows through the circulating pump 2 from the first heat storage module into the heat releasing device 3, the liquid heat storage medium is cooled by the heat releasing device 3 and then returns to the first heat storage module, and absorbs heat from the solid heat storage particles; in this process, the flow of the liquid heat storage medium is controlled by adjusting the rotating speed of the circulating pump 2, so that the outlet liquid heat storage medium temperature of the heat releasing device 3 reaches the set value; when the inlet medium temperature of the circulating pump 2 reaches the second set value, the module inlet valve and the module outlet valve of the second heat storage module of the heat storage device 1 are opened; when the outlet medium temperature of the second heat storage module reaches the fourth set value, the module inlet valves and the module outlet valves of the two heat storage modules are closed; the above process is repeated until all the heat storage modules of the heat storage device 1 complete heat releasing, then the heat releasing inlet valve 3-1, the heat releasing outlet valve 3-2 and the heating bypass valve 6 are closed, the circulating pump 2 and the heat releasing device 3 are stopped, and the heat releasing process is completed.

[0047] In the above embodiment, the two or more parallel arranged heat storage modules 7 can greatly improve the heat storage and heat releasing capacity of the heat storage device 1.

[0048] In the above embodiment, the two or more parallel arranged heat storage modules 7 in the heat storage device 1 are connected in parallel, so the first heat storage module and the second heat storage module in the above scheme are only relative, any one of the heat storage modules 7 can be the first heat storage module, and the second heat storage module is any one of the heat storage modules 7 except the first heat storage module.

[0049] In the above embodiment, all the set values can be set according to actual conditions, which can be the same or different, and the skilled in the art can set them according to actual needs, and the present application does not make specific limitations.

[0050] In the above embodiment, the heating mode of the heating device 4 is electric heating, steam heating or flue gas heating, and the heat releasing device 3 can output hot water, saturated steam, superheated steam or hot air.

[0051] It can be seen that the modular solid-liquid heat storage system of the present application converts electric energy into heat energy and stores it in the heat storage device during the peak period of new energy, and continuously outputs the heat energy during the valley period of new energy. The modular solid-liquid heat storage system of the present application uses a modular heat storage device to realize flexible operation of the heat storage system; uses solid and liquid dual medium heat storage to reduce the volume and floor area of the heat storage device and reduce engineering investment. In summary, the modular solid-liquid heat storage system of the present application can smooth the fluctuation of new energy power and realize the consumption of new energy power, helping the development of distributed new energy.

[0052] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A thermal storage module, characterized in that, The module includes a housing (7-2), with a module inlet (7-1) at the upper end and a module outlet (7-8) at the lower end. The inner cavity of the housing (7-2) is filled with solid thermal storage particles. From the bottom of the housing (7-2) upwards, the diameter of the solid thermal storage particles increases. From the bottom of the inner cavity of the module housing (7-2) upwards, the diameter growth rate of the solid thermal storage particles is 1.5~3; The diameter of the solid thermal storage particles ranges from 8 mm to 32 mm; Solid thermal storage particles are arranged in multiple layers inside the module shell (7-2). Specifically, when the height h of the inner cavity of the module shell (7-2) is less than or equal to 2m, the solid thermal storage particles are arranged in two layers; when 2 < h ≤ 4m, the solid thermal storage particles are arranged in three layers; and when h > 4m, the solid thermal storage particles are arranged in four layers. The thickness of each layer of solid thermal storage particles does not exceed 1.5m, and the solid thermal storage particles in each layer are arranged with equal thickness. The solid thermal storage particles include large-diameter solid thermal storage particles (7-4), medium-diameter solid thermal storage particles (7-5), and small-diameter solid thermal storage particles (7-6), wherein the diameter of the large-diameter solid thermal storage particles (7-4) is 24-32 mm, the diameter of the medium-diameter solid thermal storage particles (7-5) is 16-24 mm, and the diameter of the small-diameter solid thermal storage particles (7-6) is 8-16 mm. When the height h of the inner cavity of the module shell (7-2) is less than or equal to 2m, the upper layer of solid thermal storage particles uses large-diameter solid thermal storage particles (7-4), and the lower layer of solid thermal storage particles uses medium-diameter solid thermal storage particles (7-5). When 2 < h ≤ 4m, the upper layer of solid thermal storage particles uses large-diameter solid thermal storage particles (7-4), the middle layer of solid thermal storage particles uses medium-diameter solid thermal storage particles (7-5), and the lower layer of solid thermal storage particles uses small-diameter solid thermal storage particles (7-6). When h > 4m, the upper layer uses large-diameter solid thermal storage particles (7-4), the lower layer uses small-diameter solid thermal storage particles (7-6), and the layers between the upper and lower layers use medium-diameter solid thermal storage particles (7-5).

2. A thermal storage module according to claim 1, characterized in that, The upper end of the inner cavity of the module housing (7-2) is provided with an upper sealing plate (7-3) and the lower end is provided with a lower sealing plate (7-7). Solid heat storage particles are filled between the upper sealing plate (7-3) and the lower sealing plate (7-7). Both the upper sealing plate (7-3) and the lower sealing plate (7-7) are provided with through holes for fluid to flow through.

3. A modular solid-liquid thermal storage system, characterized in that, The device includes a heat storage device (1), which includes a heat storage module (7) as described in any one of claims 1-2. A circulation pump (2) is connected to the module outlet (7-8) of the module housing (7-2). The outlet of the circulation pump (2) is connected to the module inlet (7-1) through a conveying pipe (10). A heat release device (3) and a heating device (4) are sequentially provided on the conveying pipe (10). A heat release bypass pipe (9) connected in parallel with the heat release device (3) and a heating bypass pipe (8) connected in parallel with the heating device (4) are connected on the conveying pipe (10). A heat release bypass valve (5) is provided on the heat release bypass pipe (9). A heating bypass valve (6) is provided on the heating bypass pipe (8). A heat release inlet valve (3-1) is provided at the inlet of the heat release device (3) and a heat release outlet valve (3-2) is provided at the outlet. A heating inlet valve (4-1) and a heating outlet valve (4-2) are provided at the inlet of the heating device (4).

4. The modular solid-liquid thermal storage system according to claim 3, characterized in that, The heat storage device (1) includes two or more heat storage modules (7) arranged in parallel. The outlet of the circulation pump (2) is connected to the module inlet (7-1) of each module inlet (7-1) through the delivery pipe (10). The module inlet (7-1) of all heat storage modules (7) is equipped with a module inlet valve (1-1). The inlet of the circulation pump (2) is connected to the module outlet (7-8) of each module inlet (7-1). The module outlet (7-8) of each module inlet (7-1) is equipped with a module outlet valve (1-2).

5. The operating method of the modular solid-liquid thermal storage system according to claim 4, characterized in that, The process includes the following: Heat storage process: Close the heat release inlet valve (3-1), heat release outlet valve (3-2), and heating bypass valve (6), open the heating inlet valve (4-1), heating outlet valve (4-2), and heat release bypass valve (5), and start the circulation pump (2) and heating device (4); the liquid heat storage medium flows from the module outlet (7-8) of the heat storage module (7) through the circulation pump (2) into the heating device (4), and after being heated by the heating device (4), the liquid heat storage medium returns to the heat storage module (7) through the module inlet (7-1). The liquid heat storage medium flowing into the heat storage module (7) transfers heat to the solid heat storage particles; during the heat storage process, the flow rate of the liquid heat storage medium is controlled by adjusting the speed of the circulation pump (2), thereby controlling the outlet liquid heat storage medium temperature of the heating device (4) to reach the set value; when the inlet medium temperature of the circulation pump (2) reaches the first set value, close the heating inlet valve (4-1), heating outlet valve (4-2), and heat release bypass valve (5), stop the circulation pump (2) and heating device (4), and the heat storage process is completed; Heat release process: Open the heat release inlet valve (3-1), heat release outlet valve (3-2), and heating bypass valve (6), close the heating inlet valve (4-1), heating outlet valve (4-2), and heat release bypass valve (5), and start the circulation pump (2) and heat release device (3); the liquid heat storage medium flows from the module outlet (7-8) of the heat storage module (7) through the circulation pump (2) into the heat release device (3), and after being cooled by the heat release device (3), the liquid heat storage medium returns to the heat storage module (7) through the module inlet (7-1). The liquid heat storage medium flowing into the heat storage module (7) absorbs heat from the solid heat storage particles; during the heat release process, the flow rate of the liquid heat storage medium is controlled by adjusting the speed of the circulating pump (2), thereby controlling the outlet liquid heat storage medium temperature of the heat release device (3) to reach the set value; when the inlet medium temperature of the circulating pump (2) reaches the second set value, the heat release inlet valve (3-1), the heat release outlet valve (3-2), and the heating bypass valve (6) are closed, the circulating pump (2) and the heat release device (3) are stopped, and the heat release process is completed.

6. The working method of the modular solid-liquid thermal storage system according to claim 5, characterized in that, The thermal storage device (1) includes two or more thermal storage modules (7) arranged in parallel. The outlet of the circulating pump (2) is connected to the module inlet (7-1) of each module inlet (7-1) through a conveying pipe (10). All module inlets (7-1) of the thermal storage modules (7) are equipped with module inlet valves (1-1). The inlet of the circulating pump (2) is connected to the module outlet (7-8) of each module inlet (7-1). Each module outlet (7-8) of each module inlet (7-1) is equipped with a module outlet valve (1-2). The working method includes the following process: Thermal storage process: Close the heat release inlet valve (3-1), heat release outlet valve (3-2), and heating bypass valve (6); open the heating inlet valve (4-1), heating outlet valve (4-2), and heat release bypass valve (5); start the circulation pump (2) and heating device (4); open the module inlet valve (1-1) and module outlet valve (1-2) of the first thermal storage module of the thermal storage device (1), and close the module inlet valves and module outlet valves of other thermal storage modules; the liquid thermal storage medium flows from the first thermal storage module through the circulation pump (2) into the heating device (4), and after being heated by the heating device (4), the liquid thermal storage medium returns to the first thermal storage module. The liquid thermal storage medium flowing into the first thermal storage module transfers heat to the solid thermal storage particles; here During the process, the flow rate of the liquid heat storage medium is controlled by adjusting the speed of the circulating pump (2), thereby controlling the outlet liquid heat storage medium temperature of the heating device (4) to reach the set value; when the inlet medium temperature of the circulating pump (2) reaches the first set value, the module inlet valve and module outlet valve of the second heat storage module of the heat storage device (1) are opened; when the outlet medium temperature of the second heat storage module reaches the third set value, the module inlet valve and module outlet valve of the second heat storage module are closed; this cycle continues until all heat storage modules of the heat storage device (1) have completed heat storage, and then the heating inlet valve (4-1), heating outlet valve (4-2), and heat release bypass valve (5) are closed, the circulating pump (2) and the heating device (4) are stopped, and the heat storage process is completed; Heat release process: Open the heat release inlet valve (3-1), heat release outlet valve (3-2), and heating bypass valve (6); close the heating inlet valve (4-1), heating outlet valve (4-2), and heat release bypass valve (5); start the circulation pump (2) and heat release device (3); open the module inlet valve (1-1) and module outlet valve (1-2) of the first heat storage module of the heat storage device (1), and close the module inlet valve and module outlet valve of the other heat storage modules; the liquid heat storage medium flows from the first heat storage module through the circulation pump (2) into the heat release device (3), and after being cooled by the heat release device (3), the liquid heat storage medium returns to the first heat storage module and absorbs heat from the solid heat storage particles; during this process, by adjusting The rotation speed of the circulating pump (2) controls the flow rate of the liquid heat storage medium, thereby controlling the outlet liquid heat storage medium temperature of the heat release device (3) to reach the set value; when the inlet medium temperature of the circulating pump (2) reaches the second set value, the module inlet valve and module outlet valve of the second heat storage module of the heat storage device (1) are opened; when the outlet medium temperature of the second heat storage module reaches the fourth set value, the module inlet valve and module outlet valve of the two heat storage modules are closed; this cycle continues until all heat storage modules of the heat storage device (1) have completed heat release, and then the heat release inlet valve (3-1), heat release outlet valve (3-2), and heating bypass valve (6) are closed, the circulating pump (2) and the heat release device (3) are stopped, and the heat release process is completed.

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