Mine cross-season energy storage system based on cooperation of double phase change materials and control method

Abstract

The invention provides a mine cross-season energy storage system and a control method based on coordination of double phase change materials, and the energy storage system comprises a heat exchanger group, a liquid collector, a liquid separator, a surface air cooler group, and a phase change material filling body group with a phase change filling body, the phase change filling body can be filled with a first phase change material with low-temperature phase change and a second phase change material with high-temperature phase change in a layered mode, and the first phase change material and / or the second phase change material can be controlled to participate in heat exchange according to needs. Therefore, efficient integration of differentiation temperature control optimization of the mining working face and wellhead anti-freezing functions is achieved, intelligent control and effective adjustment of the system in cold / heat collection, storage and utilization are effectively ensured through gradient temperature control logic, and finally deep coupling of goaf treatment and clean energy supply is achieved.

Description

Technical Field

[0001] The present invention relates to the technical fields of mine energy management, seasonal energy storage and comprehensive treatment of goafs, and particularly relates to a mine cross-seasonal energy storage system and a control method based on the cooperation of dual phase change materials. Background Art

[0002] With the continuous increase in global energy demand and the high attention to energy utilization efficiency, the reasonable storage and effective utilization of energy are the keys to the sustainable development of today's society, and energy storage technology has become one of the key means to address this issue. Phase change energy storage technology, with the characteristics of absorbing or releasing a large amount of latent heat during the phase change process and relatively constant temperature, shows great application potential in many fields, thus realizing the efficient storage and utilization of thermal energy and opening up new ways for energy conservation and consumption reduction and performance improvement in many fields.

[0003] Mine cooling has always been an important issue in the mining industry, especially in high-temperature mines. Traditional cooling methods, such as ventilation and mechanical refrigeration, are often inefficient and energy-consuming. In the context of green mining and efficient energy utilization in mines, how to achieve multiple goals of goaf treatment, mine solid waste disposal and mine heat hazard prevention and control in a coordinated manner has become a technical bottleneck that the industry urgently needs to break through.

[0004] Some known technologies mainly solve the mine energy supply problem through the following two types of solutions: (1) sensible heat energy storage: using solid waste to fill the goaf, which has both the functions of stope stability and low-grade heat energy storage. However, there are many disadvantages, such as: the sensible heat energy storage density is relatively low, unable to meet the large-scale temperature control requirements of deep mines; the single heat storage mechanism is affected by natural cold and heat sources and fluctuates, and the seasonal regulation ability is weak, etc. (2) single-phase change material (PCM) latent heat energy storage: using the significant advantage of latent heat energy storage density to significantly improve the working efficiency. For example, using paraffin-based PCM to construct mine filling bodies for summer cooling. However, there are many disadvantages, such as: a single phase change temperature (such as 0 °C) cannot meet the requirements of ultra-low temperature cold storage in winter and high temperature heat release in summer under extreme climates;

[0005] On the other hand, the recovery of mine return air waste heat and the anti-freezing of wellheads currently mostly use independent units for operation, resulting in energy consumption superposition and complex management. Therefore, an integrated energy storage and supply system is needed to solve problems such as how to store and release high- and low-grade energies in a limited filling body space, how to broaden the system operation temperature range through material selection and cascade design, improve the working efficiency and reduce energy consumption at the same time. Summary of the Invention

[0006] Aiming at the deficiencies in the known technologies in the background art of the present invention, the present invention aims to provide a mine cross-season energy storage system and a control method based on the cooperation of dual-phase change materials. Through the collaborative combination of high / low temperature phase change materials and the gradient temperature control logic, the seasonal limitations of a single latent heat energy storage material are broken through, and finally the deep coupling of goaf treatment and clean energy supply is realized, solving at least one technical problem pointed out in the background art.

[0007] In the first aspect of the embodiments of the present invention, a mine cross-season energy storage system based on the cooperation of dual-phase change materials is provided, including:

[0008] A heat exchanger group, including one or more first heat exchangers connected in parallel. The first heat exchanger has a tube side for the heat exchange medium to flow through and a shell side for the external air to flow through. The heat exchanger group is arranged outside the mine;

[0009] A liquid collector, including one or more heat exchange medium inlets and one or more heat exchange medium outlets. The heat exchange medium inlet is connected to the tube side outlet of the first heat exchanger. The liquid collector is arranged inside the mine;

[0010] A phase change material filling body group, arranged inside the mine, including one or more phase change filling bodies connected in parallel. The phase change filling body includes a first filling space and a second filling space separated by a heat insulation material. The first filling space is used to fill the first phase change material PCM-L, and the second filling space is used to fill the second phase change material PCM-H. The phase change temperature of the first phase change material PCM-L is lower than the phase change temperature of the second phase change material PCM-H. The phase change filling body also includes a filling body inlet and a filling body outlet. A first heat exchange tube and a second heat exchange tube are connected between the filling body inlet and the filling body outlet. The first heat exchange tube is arranged in the first filling space, and the second heat exchange tube is arranged in the second filling space. The first heat exchange tube and the second heat exchange tube can be connected to the filling body inlet;

[0011] A liquid distributor, arranged inside the mine, including one or more liquid distributor inlets and a liquid distributor outlet. The liquid distributor inlet is connected to the filling body outlet, and the liquid distributor outlet is connected to the tube side inlet of the first heat exchanger;

[0012] A surface cooler group, including one or more surface coolers connected in parallel. All or part of the surface coolers are arranged in the mining face and / or the chamber. The surface cooler has a surface cooler inlet and a surface cooler outlet. The surface cooler inlet is connected to the liquid distributor outlet, and the surface cooler outlet is connected to the heat exchange medium inlet.

[0013] The technical solution provided by the embodiments of the present invention has the beneficial effects that: while conforming to the development trend of low-cost green filling in the mine goaf, the advantages of large latent heat storage density of phase change materials are utilized to empower the filling body, store self-energy cold energy and thermal energy, and are used for mine cooling and mine heating, aiming to solve the problems of high energy consumption and high cost in the current mine cooling in summer and anti-freezing / warming needs in winter. The present invention breaks through the seasonal limitation of a single latent heat energy storage material, broadens the operating temperature range of the system, and reduces energy consumption while improving work efficiency. Through the coordinated combination of high / low temperature phase change materials, the differential temperature control optimization of the mining face and the efficient integration of the anti-freezing function at the wellhead are realized. Through the gradient temperature control logic, the intelligent control and effective regulation of the system in cold / heat collection, storage and utilization are effectively ensured, and finally the deep coupling of goaf treatment and clean energy supply is realized.

[0014] In a possible implementation manner, the mine cross-season energy storage system based on the cooperation of dual phase change materials further includes: a second heat exchanger, which is arranged in the mine entrance roadway and is used for heating the mine entrance roadway. The second heat exchanger includes a tube side for the heat exchange medium to flow through and a shell side for the air to flow through. The inlet of the tube side of the second heat exchanger is connected to the outlet of the distributor, and the outlet of the tube side of the second heat exchanger is connected to the inlet of the distributor.

[0015] In a possible implementation manner, the mine cross-season energy storage system based on the cooperation of dual phase change materials further includes: a return pipe and a water tank. The inlet of the return pipe is connected to the outlet of the distributor, the outlet of the return pipe is connected to the heat exchange medium inlet, and at least a part of the return pipe is arranged in the water tank.

[0016] In a possible implementation manner, the mine cross-season energy storage system based on the cooperation of dual phase change materials further includes: a chiller, which includes an evaporator, a compressor, a condenser and a throttle valve. The evaporator is arranged in the water tank and is used for releasing cold energy to cool the water in the water tank.

[0017] In a possible implementation, the mine cross-season energy storage system based on the cooperation of dual-phase change materials further includes: a first temperature sensor disposed in the water tank for obtaining the water temperature; a second temperature sensor disposed near the chiller for obtaining the ambient temperature of the chiller; based on the ambient temperature of the chiller being higher than 22°C, controlling the operation of the chiller so that the water temperature in the water tank is within a range of ± a first threshold value of the ambient temperature of the chiller; based on the water temperature in the water tank being lower than the ambient temperature of the chiller by more than the first threshold value, controlling to turn off the compressor of the chiller; based on the water temperature in the water tank being higher than the ambient temperature of the chiller by more than the first threshold value, controlling to turn on the compressor of the chiller; based on the ambient temperature of the chiller being higher than 22°C, controlling to turn off the compressor and the condenser of the chiller. In a possible implementation, the phase change temperature range of the first phase change material PCM-L is -20 - 10°C or -10 - 0°C, and the phase change temperature range of the second phase change material PCM-H is 5 - 15°C; the second filling space is located above the first filling space and satisfies H1:H2 ≤ 1:2, where: H1 is the height of the second filling space and H2 is the height of the first filling space.

[0018] In a possible implementation, the shell side of the first heat exchanger includes a low-temperature heat exchange channel and a high-temperature heat exchange channel, where the low-temperature heat exchange channel corresponds to the pipeline connected to the first phase change material PCM-L, and the high-temperature heat exchange channel corresponds to the pipeline connected to the second phase change material PCM-H; the first heat exchange fan and the second heat exchange fan are respectively arranged in the low-temperature heat exchange channel and the high-temperature heat exchange channel.

[0019] In a possible implementation, the mine cross-season energy storage system based on the cooperation of dual-phase change materials further includes: a third temperature sensor and / or a fourth temperature sensor and / or a fifth temperature sensor and / or, where: the third temperature sensor is disposed outside the mine for obtaining the external ambient temperature; the fourth temperature sensor and the fifth temperature sensor are respectively disposed in the first filling space and the second filling space for obtaining the temperatures of the first phase change material and the second phase change material respectively.

[0020] In a second aspect of the embodiments of the present invention, a control method for a mine cross-season energy storage system based on the cooperation of dual-phase change materials is provided, which is applicable to the energy storage system provided in the first aspect of the embodiments of the present invention. A control method for a mine cross-season energy storage system based on the cooperation of dual-phase change materials, in winter, obtains the temperature T outside the mine W , the temperature T of the first phase change material L , the temperature T of the second phase change material H , and the temperature in the mining face or chamber is T G1and the temperature T0 at the mine entrance; based on the temperature T outside the mine W < the temperature T of the first phase change material L , control the pipeline connected to the first filling space to be turned on and the pipeline connected to the second filling space to be turned off, so that the first phase change material PCM-L freezes; based on the temperature T of the first phase change material L < based on the temperature T outside the mine W < the temperature T of the second phase change material H , control the pipeline connected to the first filling space to be turned off and the pipeline connected to the second filling space to be turned on, so that the second phase change material PCM-H freezes; based on T G1 > 26°C, control the heat exchange medium flowing out of the distributor to flow into the surface cooler group; based on T0 ≤ 2°C, control the first heat exchange pipe to be turned off and the second heat exchange pipe to be turned on, and control the heat exchange medium flowing out of the distributor to flow into the second heat exchanger at the mine entrance.

[0021] In a possible implementation, in summer, obtain the temperature T in the mining face or chamber G ; based on T G > 30°C or continuously higher than 28°C for more than a preset duration, control the pipeline connected to the first filling space and the pipeline connected to the second filling space to be turned on; based on the temperature T of the second phase change material H < the temperature T in the mining face or chamber G < 30°C, control the pipeline connected to the second filling space to be turned on and the pipeline connected to the first filling space to be turned off, and control the heat exchange medium flowing out of the distributor to flow into the surface cooler group.

[0022] The control method of the mine cross-season energy storage system based on the cooperation of dual phase change materials provided in the second aspect of the embodiments of the present invention can produce beneficial technical effects similar to those of the technical solution provided in the first aspect of the embodiments, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation manners of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific implementation manners or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 Schematic diagram of a mine cross-season energy storage system based on the cooperation of dual phase change materials provided by the embodiments of the present invention;

[0025] Figure 2 Schematic cross-sectional view of the phase change filler in the embodiments of the present invention;

[0026] Figure 3 Schematic logic block diagram of a control method for a mine cross-season energy storage system based on the cooperation of dual-phase change materials in an embodiment of the present invention;

[0027] Figure 4 Control logic block diagram of the water-cooled unit in an embodiment of the present invention.

[0028] Wherein: 1, 2, 3, 4 - phase change fillers; 5 - second filling space; 6 - thermal insulation material; 7 - first filling space; 8 - surface of the mine roadway; 9 - mining face; 10 - chamber; 11, 12, 13, 14 - surface coolers; 15, 16, 17, 18 - first heat exchangers; 19 - second heat exchanger; 20 - mine entrance roadway; 21 - water tank; 22 - throttle valve; 23 - condenser; 24 - compressor; 25 - evaporator; 27 - first temperature sensor; 26 - second temperature sensor; 30 - accumulator; 31 - distributor; 32 - ground; 28 - third temperature sensor; 62 - fifth temperature sensor; 63 - fourth temperature sensor; 64 - first heat exchange tube; 65 - second heat exchange tube; 34 - first check valve; 36 - first valve; 37 - second check valve; 38 - third check valve; 39 - second valve; 40 - third valve; 41 - fourth check valve; 42 - fifth check valve; 43 - fourth valve; 45 - fifth valve; 46 - sixth valve; 47 - seventh valve; 48 - sixth check valve; 49 - seventh check valve; 50 - eighth valve; 51 - ninth valve; 52 - eighth check valve; 53 - ninth check valve; 54 - tenth valve; 35 - first multi-stage solution pump; 44 - second multi-stage solution pump; 55 - third multi-stage solution pump; 56 - fourth multi-stage solution pump; 57 - fifth multi-stage solution pump; 58 - sixth multi-stage solution pump; 59 - seventh multi-stage solution pump; 60 - eighth multi-stage solution pump; 61 - ninth multi-stage solution pump. Detailed implementation manners

[0029] The following details the implementation manners of the present application. Examples of the implementation manners are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The implementation manners described below with reference to the drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0030] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, it should be noted that the meaning of "a plurality of" is two or more unless otherwise specifically defined.

[0031] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" shall be construed broadly. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection, an electrical connection or a connection capable of mutual communication; it may be directly connected or indirectly connected through an intermediate medium; it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application may be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first feature and the second feature, or may include the situation where the first feature and the second feature are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal thickness of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal thickness of the first feature is smaller than that of the second feature.

[0033] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0034] Figure 1 This is a schematic diagram of a mine seasonal energy storage system based on dual phase change material synergy provided by an embodiment of the present invention. Figure 2 Schematic cross-sectional view of phase change fillers 1, 2, 3, and 4 in an embodiment of the present invention.

[0035] refer to Figure 1 and Figure 2 A mine seasonal energy storage system based on dual phase change material collaboration includes a heat exchanger group, a liquid collector 30, a phase change material filling body group, a liquid separator 31 and a surface cooler group.

[0036] The heat exchanger group includes one or more first heat exchangers 15, 16, 17, 18 connected in parallel. The first heat exchangers 15, 16, 17, 18 have a tube side for the flow of heat exchange medium and a shell side for the flow of external air. The heat exchanger group is arranged outside the mine.

[0037] For example, Figure 1 As shown, the heat exchanger group includes four first heat exchangers 15, 16, 17, and 18, and the first heat exchangers 15, 16, 17, and 18 are structured in a serpentine sleeve form, with the heat exchange medium flowing through the tube side and the air flowing through the shell side. The shell side is divided into a low-temperature heat exchange channel and a high-temperature heat exchange channel by a longitudinal partition (heat-resistant composite plate). The low-temperature channel corresponds to the pipeline connected to the low-temperature layer (i.e., the layer where the first phase change material PCM-L is located), and the high-temperature channel corresponds to the pipeline connected to the high-temperature layer (the layer where the second phase change material PCM-H is located). A dust removal net and independent dual fans are set at the heat exchanger inlet to ensure dust removal and forced heat exchange when air cooling is used to cool the heat exchange medium in winter.

[0038] In other possible implementations, the first heat exchangers 15 , 16 , 17 , 18 may be of other numbers or types, or the heat exchanger group may be composed of a combination of multiple different types of first heat exchangers 15 , 16 , 17 , 18 .

[0039] The liquid collector 30 includes one or more heat exchange medium inlets and one or more heat exchange medium outlets. The heat exchange medium inlets are connected to the pipe-side outlets of the first heat exchangers 15, 16, 17, and 18. The liquid collector 30 is set in the mine.

[0040] like Figure 1 As shown, the liquid collector 30 is placed at the top of the mine tunnel. Made of corrosion-resistant, high-pressure-resistant steel, it is located within the mine tunnel. Rubber and plastic foam is attached to the exterior for insulation. It features a first heat exchange medium inlet, a second heat exchange medium inlet, a third heat exchange medium inlet, and four heat exchange medium outlets. Its primary function is to collect heat exchange medium from the heat exchanger group and the surface cooler group and evenly distribute it to the heat exchange tube group.

[0041] A phase change material filling body group is arranged in a mine and includes one or more parallel phase change filling bodies 1, 2, 3, 4. The phase change filling bodies 1, 2, 3, 4 include a first filling space 7 and a second filling space 5 separated by a heat insulation material 6. The first filling space 7 is used to fill a first phase change material PCM-L, and the second filling space 5 is used to fill a second phase change material PCM-H. The phase change temperature of the first phase change material PCM-L is lower than that of the second phase change material PCM-H. The phase change filling bodies 1, 2, 3, 4 further include a filling body inlet and a filling body outlet. A first heat exchange tube 64 and a second heat exchange tube 65 are connected between the filling body inlet and the filling body outlet. The first heat exchange tube 64 is arranged in the first filling space 7, and the second heat exchange tube 65 is arranged in the second filling space 5. The first heat exchange tube 64 and the second heat exchange tube 65 can be connected to the filling body inlet.

[0042] As Figure 1 and Figure 2 shown, the phase change material filling body group includes four phase change filling bodies 1, 2, 3, 4, all arranged in the goaf of the mine and composed of a low-temperature phase change layer (i.e., the layer where the first phase change material PCM-L is located) and a high-temperature phase change layer (the layer where the second phase change material PCM-H is located). It should be noted that the so-called "high temperature" and "low temperature" here are only relative to each other. The one with a higher phase change working temperature is defined as "high temperature", and the one with a lower phase change temperature is defined as "low temperature".

[0043] The double-phase change material is mainly composed of two phase change materials with different phase change temperatures. The low-temperature phase change layer (the first phase change material PCM-L) is filled at the bottom of the filling body, and a phase change material with a phase change temperature of ≤0°C is selected (in severe cold areas, a phase change material with a phase change temperature of -20 - 10°C can be selected, and in other areas, a phase change material with a phase change temperature of -10 - 0°C can be selected). The high-temperature phase change layer (the second phase change material PCM-H) is filled at the top of the filling body, and a phase change material with a phase change temperature of 5 - 15°C is selected. The two phase change layers can be separated by a vacuum insulation board to facilitate the zonal control of heat transfer through the heat exchange tube group. Preferably, referring to the appendix Figure 2 , the second filling space 5 is located above the first filling space 5 and satisfies H1:H2 ≤ 1:2, where: H1 is the height of the second filling space 5, and H2 is the height of the first filling space 5, making the cold storage effect of the system better in the deep winter.

[0044] The heat exchange tube group penetrates through the low-temperature layer and the high-temperature layer and includes two independently controlled pipelines, the first heat exchange tube 64 and the second heat exchange tube 65, corresponding to the first filling space 7 filled with the first phase change material and the second filling space 5 filled with the second phase change material respectively.

[0045] The material of the first heat exchange tube 64 and the second heat exchange tube 65 is a plastic material that is resistant to high temperature, high pressure, low temperature, corrosion, stable in chemical properties, has good thermal conductivity, and has low flow resistance. The tube spacing of the first heat exchange tube 64 and the second heat exchange tube 65 is designed according to the thermal conductivity of the material.

[0046] The liquid separator 31 is arranged in the mine and includes one or more liquid separator inlets and a liquid separator outlet. The liquid separator 31 inlet is connected to the phase change filler outlet, and the liquid separator 31 outlet is connected to the pipe side inlet of the first heat exchanger 15, 16, 17, 18.

[0047] like Figure 1 As shown, the liquid separator 31 is set at the bottom of the mine tunnel. The material is corrosion-resistant steel, and the outside of the shell is pasted with rubber and plastic cotton for insulation. The liquid separator 31 is provided with two liquid separator inlets and a five-four liquid separator outlet; its main function is to collect the heat exchange medium from the heat exchange group and the second heat exchanger 19, and evenly distribute the heat exchange medium to the second heat exchanger 19, the surface cooler group, the return pipe and the heat exchanger group. It is understandable that the number of the aforementioned liquid separator inlets and liquid separator outlets is merely a schematic illustration and is not an absolute limitation to the embodiments of the present application. Those skilled in the art can adjust the specific number according to actual needs.

[0048] The surface cooler group includes one or more parallel surface coolers 11, 12, 13, 14. All or part of the surface coolers 11, 12, 13, 14 are arranged at the mining working face and / or the chamber 10. The surface coolers 11, 12, 13, 14 have surface cooler 11, 12, 13, 14 inlets and surface cooler 11, 12, 13, 14 outlets. The surface cooler 11, 12, 13, 14 inlets are connected to the outlet of the liquid separator 31, and the surface cooler 11, 12, 13, 14 outlets are connected to the heat exchange medium inlet.

[0049] like Figure 1 As shown, the surface cooler group consists of four surface coolers 11, 12, 13, and 14 connected in parallel and placed at the mining face or chamber 10. The structure is in the form of spiral baffles, with a dust screen installed on the outside and rollers installed on the bottom for easy movement. In other possible embodiments, the surface cooler group can include more or fewer surface coolers 11, 12, 13, and 14.

[0050] In the embodiments of the present invention, the heat exchange medium circulates in the above components to achieve heat exchange. The heat exchange medium has the characteristics of low freezing point, anti-freezing property (able to adapt to cold energy storage in cold environments), high evaporation point (needs to withstand the high-temperature environment in mines), non-toxic, low cost, and no / low corrosion. The heat exchange medium exists in the closed pipeline inside the heat exchange tube group, and it flows through the circulation pipeline in the whole system, and indirectly exchanges heat with the surrounding double-phase change material filling body through the pipe wall, ensuring physical isolation between the heat exchange medium and the filling material to avoid pollution or chemical reactions; when necessary in summer, water can be used as the heat exchange medium for direct heat exchange, which can meet the requirements of green mining in mines, improve the cooling efficiency, and reduce the initial investment and operation and maintenance costs of the system.

[0051] The technical solution provided by the embodiments of the present invention has the beneficial effects that: while conforming to the development trend of low-cost green filling in the mined-out areas of mines, by utilizing the advantage of the large latent heat storage density of phase change materials to empower the filling body, self-energy cold energy and heat energy are stored for mine cooling and mine heating, aiming to solve the problems of high energy consumption and high cost in the current mine cooling in summer and anti-freezing / warming in winter. The present invention breaks through the seasonal limitation of a single latent heat energy storage material, broadens the operating temperature range of the system, improves the working efficiency and reduces energy consumption, etc. Through the coordinated combination of high / low temperature phase change materials, the differential temperature control optimization of the mining face 9 and the efficient integration of the anti-freezing function at the wellhead are realized. Through the gradient temperature control logic, the intelligent control and effective regulation of the system in cold / heat collection, storage and utilization are effectively ensured, and finally the deep coupling of mined-out area treatment and clean energy supply is realized.

[0052] As Figure 1 shown, in a possible implementation manner, the mine cross-season energy storage system based on the cooperation of double-phase change materials further includes: a second heat exchanger 19, which is arranged in the mine entrance roadway 20 and is used to heat the mine entrance roadway 20. The second heat exchanger 19 includes a tube side for the heat exchange medium to flow through and a shell side for air to flow through. The inlet of the tube side of the second heat exchanger 19 is connected to the outlet of the distributor 31, and the outlet of the tube side of the second heat exchanger 19 is connected to the inlet of the distributor 31.

[0053] The second heat exchanger 19 is placed at the roadway wellhead and is used for anti-freezing at the wellhead in winter and auxiliary cold storage in summer. The second heat exchanger 19 can adopt the same type as the first heat exchangers 15, 16, 17, 18.

[0054] As Figure 1 shown, in a possible implementation manner, the mine cross-season energy storage system based on the cooperation of double-phase change materials further includes: a return pipe and a water tank 21. The inlet of the return pipe is connected to the outlet of the distributor 31, the outlet of the return pipe is connected to the heat exchange medium inlet, and at least a part of the return pipe is arranged in the water tank 21.

[0055] The water tank 21 is placed on the ground 32 outside the mine, above the highest point of the system. Its main functions are to discharge the air in the system and, when the cold energy stored in the body is insufficient for mine cooling in summer, through the operation logic of the chiller, water can be used as a heat exchange medium for direct heat exchange. Its liquid level should be maintained between 1 / 3 and 2 / 3 of the internal height of the water tank 21.

[0056] In a possible implementation, the mine seasonal energy storage system based on the cooperation of dual phase change materials further includes: a chiller, including an evaporator 25, a compressor 24, a condenser 23, and a throttle valve 22. The evaporator 25 is arranged in the water tank 21 and is used to release cold energy to cool the water in the water tank 21.

[0057] The chiller consists of the four major components of refrigeration: evaporator 25, compressor 24, condenser 23, and throttle valve 22.

[0058] In a possible implementation, the mine seasonal energy storage system based on the cooperation of dual phase change materials further includes: a first temperature sensor 27 arranged in the water tank 21 for obtaining the water temperature; a second temperature sensor 26 arranged near the chiller for obtaining the ambient temperature of the chiller; based on the ambient temperature of the chiller being higher than 22 °C, controlling the operation of the chiller so that the water temperature in the water tank 21 is within the range of ± the first threshold of the ambient temperature of the chiller; based on the water temperature in the water tank 21 being lower than the ambient temperature of the chiller by more than the first threshold, controlling to turn off the compressor 24 of the chiller; based on the water temperature in the water tank 21 being higher than the ambient temperature of the chiller by more than the first threshold, controlling to turn on the compressor 24 of the chiller; based on the ambient temperature of the chiller being higher than 22 °C, controlling to turn off the compressor 24 and the condenser 23 of the chiller. Exemplarily, the first threshold can be set to 2 °C. Through the control logic, the supply water temperature is stably controlled within the range of the working face ambient temperature ± 2 °C, which is beneficial to improving the overall energy efficiency level of the system.

[0059] In a possible implementation, the phase change temperature range of the first phase change material PCM-L is -20 - 10 °C or -10 - 0 °C, and the phase change temperature range of the second phase change material PCM-H is 5 - 15 °C. As Figure 2 shown, the second filling space 5 is located above the first filling space 7 and satisfies H1:H2 ≤ 1:2, where: H1 is the height of the second filling space 5, and H2 is the height of the first filling space 7.

[0060] In a possible implementation, the shell sides of the first heat exchangers 15, 16, 17, 18 include a low-temperature heat exchange channel and a high-temperature heat exchange channel, where the low-temperature heat exchange channel corresponds to the pipeline connected to the first phase change material PCM-L, and the high-temperature heat exchange channel corresponds to the pipeline connected to the second phase change material PCM-H; a first heat exchange fan and a second heat exchange fan are respectively arranged in the low-temperature heat exchange channel and the high-temperature heat exchange channel.

[0061] like Figure 1 As shown, in a possible embodiment, the mine cross-season energy storage system based on the cooperation of dual phase change materials also includes: a third temperature sensor and / or a fourth temperature sensor 63 and / or a fifth temperature sensor 62, wherein: the third temperature sensor is arranged outside the mine to obtain the external ambient temperature; the fourth temperature sensor 63 and the fifth temperature sensor 62 are respectively arranged in the first filling space 7 and the second filling space 5, and are respectively used to obtain the temperatures of the first phase change material and the second phase change material.

[0062] like Figure 1 As shown, in order to achieve the smooth flow of heat exchange medium in various components and pipelines, as well as to achieve corresponding control and switching and realize efficient heat exchange, some valves for controlling the flow of heat exchange medium, pumps for providing flow power for heat exchange medium, and temperature sensors for obtaining temperature parameters are necessary. Figure 1 In the illustrated embodiment, it further includes: a first temperature sensor 27, a third temperature sensor 28, a first check valve 34, a first valve 36, a second check valve 37, a third check valve 38, a second valve 39, a third valve 40, a fourth check valve 41, a fifth check valve 42, a fourth valve 43, a fifth valve 45, a sixth valve 46, a seventh valve 47, a sixth check valve 48, a seventh check valve 49, an eighth valve 50, a ninth valve 51, an eighth check valve 52, a ninth check valve 53, a tenth valve 54, a first multi-stage solution pump 35, a second multi-stage solution pump 44, a third multi-stage solution pump 55, a fourth multi-stage solution pump 56, a fifth multi-stage solution pump 57, a sixth multi-stage solution pump 58, a seventh multi-stage solution pump 59, an eighth multi-stage solution pump 60, and a ninth multi-stage solution pump 61. The specific locations of these components can be found in the attached drawings. Figure 1 Its specific functions and setting purposes are clear and undisputed in combination with the description in the text part of this application specification, so they will not be repeated here.

[0063] Figure 3 It is a schematic logic block diagram of a control method for a mine cross-season energy storage system based on the cooperation of dual phase change materials in an embodiment of the present invention.

[0064] The second aspect of the embodiment of the present invention provides a control method for a mine cross-season energy storage system based on the cooperation of dual phase change materials, which is applicable to the energy storage system provided by the first aspect of the embodiment of the present invention. A control method for a mine cross-season energy storage system based on the cooperation of dual phase change materials: In winter, the temperature outside the mine is obtained. W , the first phase change material temperature T L , the second phase change material temperature T H , the temperature in the mining working face or chamber 10 is T G1 And the temperature at the mine entrance T0; based on the temperature outside the mine TW <The temperature T of the first phase change material L ,control the pipeline connected to the first filling space 7 to conduct and the pipeline connected to the second filling space 5 to close, so that the first phase change material PCM-L freezes; based on the temperature T of the first phase change material L <Based on the temperature T outside the mine W <The temperature T of the second phase change material H ,control the pipeline connected to the first filling space 7 to close and the pipeline connected to the second filling space 5 to conduct, so that the second phase change material PCM-H freezes; based on T G1 >26 °C, control the heat exchange medium flowing out of the distributor 31 to flow into the surface cooler group; based on T0 ≤ 2 °C, control to close the first heat exchange tube 64 and conduct the second heat exchange tube 65, and control the heat exchange medium flowing out of the distributor 31 to flow into the second heat exchanger 19 at the mine entrance.

[0065] In winter, the outdoor temperature is T W ,the temperature of the high-temperature phase change material is T H ,the temperature of the low-temperature phase change material is T L . When T W <T L , activate the primary energy storage (activate the first phase change material PCM-L), control the pipeline connected to the first filling space 7 to conduct and the pipeline connected to the second filling space 5 to close, the low-temperature channel runs at full speed, and preferentially freeze the first phase change material PCM-L; when T L <T W <T H , activate the secondary energy storage (supplementary storage of the second phase change material PCM-H), that is, turn on the high-temperature pipeline for cold storage, control the pipeline connected to the first filling space 7 to close and the pipeline connected to the second filling space 5 to conduct, so that the second phase change material PCM-H partially solidifies. The thermal energy stored in the phase change fillers 1, 2, 3, 4 exchanges heat with the heat exchange medium in the heat exchange tube group. The heated heat exchange medium is pumped to the distributor 31, and is distributed by the distributor 31 to the surface coolers 11, 12, 13, 14 with a temperature of T G1 in the mining face or chamber 10 for cooling. The starting condition is T G1 >26 °C; or distributed to the second heat exchanger 19 with a temperature of T0 at the wellhead for heating the mining face and chamber 10 and preventing freezing at the wellhead. When T0 ≤ 2 °C, the thermal energy (5 - 15 °C) stored in the second phase change material PCM-H is called, and the incoming air flow is preheated through the fifth tube heat exchanger to heat the wellhead air to above 4 °C. The heated heat exchange medium will be pumped to the collector 30 for collection and then redistributed to the heat exchange tube group to complete the replacement of cold energy.

[0066] In a possible implementation, in summer, obtain the temperature T in the mining face or chamber 10 G; Based on T G > 30 °C or continuously higher than 28 °C for a preset duration, control the pipe connected to the first filling space 7 and the pipe connected to the second filling space 5 to conduct; Based on the temperature T of the second phase change material H < the temperature T in the mining face or chamber 10 G < 30 °C, control the pipe connected to the second filling space 5 to conduct and close the pipe connected to the first filling space 7, and control the heat exchange medium flowing out of the liquid distributor 31 to flow into the surface cooler group.

[0067] In summer, the working face temperature is T G , the condition for the double-phase change material to release cold is: if T G > 30 °C or higher than 28 °C for more than two hours, trigger the combined cooling of the double-phase change layer, control the pipe connected to the first filling space 7 and the pipe connected to the second filling space 5 to conduct (a temperature sensor is set in each phase change material area to obtain the temperature T L , T H , and feedback it to the valve of the liquid distributor 31 in real time, and adjust the flow distribution according to the ΔT = 3 - 5 °C gradient); when T H < T G < 30 °C, preferentially start the cold release of the high-temperature layer, that is, control the pipe connected to the second filling space 5 to conduct and close the pipe connected to the first filling space 7, and ensure that the working face temperature is stable at about 26 °C. The cold energy stored in the filling body exchanges heat with the heat exchange medium in the heat exchange tube group, and the cooled heat exchange medium is pumped to the liquid distributor 31, and is distributed by the liquid distributor 31 to the surface coolers 11, 12, 13, 14 with the temperature of T G in the mining face or chamber 10 for summer cooling. The heated heat exchange medium will be pumped to the liquid collector 30 for collection and then redistributed to the heat exchange tube group to complete the replacement of cold energy.

[0068] Figure 4 is the control logic block diagram of the water-cooled unit in the embodiment of the present invention.

[0069] As Figure 4 shown, its operation logic is that when the cold energy stored in the filling body in summer is not enough to support the summer mine cooling, it can also be used for direct heat exchange through the water-cooled heat exchange method, that is, water is used as the heat exchange medium. The operating conditions of the water chiller are: when the ambient temperature where the water chiller is located is higher than 22 °C, open the manual valve and water pump of the water-cooled system water circuit, and control the supply water temperature within the range of the ambient temperature ± threshold. When the supply water temperature is lower than the ambient temperature - threshold, close the compressor 24 of the water chiller; when the supply water temperature is higher than the ambient temperature + threshold, open the compressor 24 of the water chiller; when the ambient temperature where the water chiller is located is lower than 22 °C, the entire water-cooled system is closed, including closing the compressor 24, condenser 23, etc.

[0070] For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present application is defined by the appended claims rather than the above description. Therefore, it is intended to cover all changes falling within the meaning and scope of the equivalent elements of the claims in the present application.

Claims

1. A mine seasonal cross - season energy storage system based on the cooperation of dual - phase change materials, characterized in that, Comprising: A heat exchanger group, including one or more first heat exchangers (15, 16, 17, 18) connected in parallel, the first heat exchanger having a tube side for the heat exchange medium to flow through and a shell side for the external air to flow through, and the heat exchanger group is arranged outside the mine; A liquid collector (30), including one or more heat exchange medium inlets and one or more heat exchange medium outlets, the heat exchange medium inlets are connected to the tube side outlets of the first heat exchangers (15, 16, 17, 18), and the liquid collector (30) is arranged inside the mine; A phase change material filling body group, arranged inside the mine, including one or more phase change filling bodies (1, 2, 3, 4) connected in parallel, the phase change filling body (1, 2, 3, 4) includes a first filling space (7) and a second filling space (5) separated by a heat insulation material (6), the first filling space (7) is used for filling a first phase change material PCM-L, the second filling space (5) is used for filling a second phase change material PCM-H, the phase change temperature of the first phase change material PCM-L is lower than the phase change temperature of the second phase change material PCM-H, the phase change filling body (1, 2, 3, 4) also includes a filling body inlet and a filling body outlet, and a first heat exchange tube (64) and a second heat exchange tube (65) are connected between the filling body inlet and the filling body outlet, wherein the first heat exchange tube (64) is arranged inside the first filling space (7), the second heat exchange tube (65) is arranged inside the second filling space (5), and the first heat exchange tube (64) and the second heat exchange tube (65) can be connected to the filling body inlet; A liquid distributor (31), arranged inside the mine, including one or more liquid distributor inlets and a liquid distributor outlet, the liquid distributor (31) inlets are connected to the outlets of the filling bodies (1, 2, 3, 4), and the liquid distributor outlet is connected to the tube side inlet of the first heat exchangers (15, 16, 17, 18); A surface cooler group, including one or more surface coolers (11, 12, 13, 14) connected in parallel, all or part of the surface coolers (11, 12, 13, 14) are arranged in the mining face (9) and / or the chamber (10), the surface coolers (11, 12, 13, 14) have a surface cooler inlet and a surface cooler outlet, the surface cooler inlet is connected to the liquid distributor outlet, and the surface cooler outlet is connected to the heat exchange medium inlet.

2. The mine seasonal cross - season energy storage system based on the cooperation of dual - phase change materials according to claim 1, wherein Further comprising: A second heat exchanger (19), arranged in the mine entrance roadway (20) for heating the mine entrance roadway, the second heat exchanger (19) includes a tube side for the heat exchange medium to flow through and a shell side for the air to flow through, the inlet of the tube side of the second heat exchanger (19) is connected to the liquid distributor (31) outlet, and the outlet of the tube side of the second heat exchanger (19) is connected to the liquid distributor (31) inlet.

3. The mine cross-season energy storage system based on the cooperation of dual-phase change materials according to claim 1, characterized in that, Further comprising: A return pipe and a water tank (21), the inlet of the return pipe is connected to the liquid distributor outlet, the outlet of the return pipe is connected to the heat exchange medium inlet, and at least a part of the return pipe is arranged inside the water tank (21).

4. The mine cross-season energy storage system based on the cooperation of dual-phase change materials according to claim 3, characterized in that Further comprising: A chiller, comprising an evaporator (25), a compressor (24), a condenser (23) and a throttle valve (22), wherein the evaporator (25) is arranged in the water tank (21) and is used to release cold to cool the water in the water tank (21).

5. The mine cross-season energy storage system based on the cooperation of dual-phase change materials according to claim 4, characterized in that It further comprises: A first temperature sensor (27), arranged in the water tank (21) and used to obtain the water temperature; A second temperature sensor (26), arranged near the chiller and used to obtain the ambient temperature of the chiller; Based on the ambient temperature of the chiller being higher than 22°C, control the operation of the chiller so that the water temperature in the water tank (21) is within the range of ± the first threshold value of the ambient temperature of the chiller; based on the water temperature in the water tank (21) being lower than the ambient temperature of the chiller by more than the first threshold value, control to turn off the compressor (24) of the chiller; based on the water temperature in the water tank (21) being higher than the ambient temperature of the chiller by more than the first threshold value, control to turn on the compressor (24) of the chiller; based on the ambient temperature of the chiller being higher than 22°C, control to turn off the compressor (24) and the condenser (23) of the chiller.

6. The mine seasonal energy storage system based on the cooperation of two-phase change materials according to claim 5, characterized in that The phase change temperature range of the first phase change material PCM-L is -20 - 10°C or -10 - 0°C, and the phase change temperature range of the second phase change material PCM-H is 5 - 15°C; the second filling space is located above the first filling space and satisfies H1:H2 ≤ 1:2, where: H1 is the height of the second filling space (5), and H2 is the height of the first filling space (7).

7. The mine seasonal energy storage system based on the cooperation of two-phase change materials according to claim 6, characterized in that The shell side of the first heat exchanger (15, 16, 17, 18) includes a low-temperature heat exchange channel and a high-temperature heat exchange channel, wherein the low-temperature heat exchange channel corresponds to the pipeline communicated with the first phase change material PCM-L, and the high-temperature heat exchange channel corresponds to the pipeline communicated with the second phase change material PCM-H; the first heat exchange fan and the second heat exchange fan are respectively arranged in the low-temperature heat exchange channel and the high-temperature heat exchange channel.

8. The mine seasonal cross - season energy storage system based on the cooperation of dual - phase change materials according to claim 7, wherein, It further comprises: A third temperature sensor and / or a fourth temperature sensor and / or a fifth temperature sensor, wherein: the third temperature sensor is arranged outside the mine and used to obtain the external ambient temperature; the fourth temperature sensor (63) and the fifth temperature sensor (62) are respectively arranged in the first filling space (7) and the second filling space (5) and are respectively used to obtain the temperatures of the first phase change material and the second phase change material.

9. A control method for a mine seasonal energy storage system based on the cooperation of two-phase change materials, applied to the energy storage system according to any one of claims 1 - 8, characterized in that In winter, obtain the temperature T outside the mine W , the temperature T of the first phase change material L , the temperature T of the second phase change material H , the temperature in the mining face or chamber is T G1 and the temperature T0 at the mine entrance; Based on the temperature T outside the mine W <The temperature T of the first phase change material L , control the pipeline connected to the first filling space to be turned on and the pipeline connected to the second filling space to be turned off, so that the first phase change material PCM-L freezes; Based on the temperature T of the first phase change material L <Based on the temperature T outside the mine W <The temperature T of the second phase change material H , control the closing of the pipeline connected to the first filling space and the opening of the pipeline connected to the second filling space, so that the second phase change material PCM-H freezes; Based on T G1 > 26°C, control the heat exchange medium flowing out of the liquid distributor to flow into the surface cooler group; based on T0 ≤ 2°C, control to close the first heat exchange tube and conduct the second heat exchange tube, and control the heat exchange medium flowing out of the liquid distributor to flow into the second heat exchanger at the mine entrance.

10. The control method for a mine seasonal energy storage system based on the cooperation of two-phase change materials according to claim 9, characterized in that In summer, obtain the temperature T in the mining face or chamber G ; Based on T G When the temperature is > 30°C or continuously higher than 28°C for a preset duration, control the pipelines connected to the first filling space and the pipelines connected to the second filling space to conduct. Based on the temperature T of the second phase change material H <The temperature T in the mining face or chamber G <30 °C, control the pipeline connected to the second filling space to conduct and close the pipeline connected to the first filling space, and control the heat exchange medium flowing out of the distributor to flow into the surface cooler group.

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