Mine chamber temperature control system and method based on day and night cold storage and phase change regulation and control

Abstract

The invention discloses a mine chamber temperature control system and method based on day and night cold storage and phase change regulation and control. The temperature control system comprises a heat exchanger group, a liquid collector, a phase change material filling body group, a liquid separator, a surface air cooler group and a cooling tower. The phase change material can store cold energy brought by the heat exchange medium, and when the chamber needs the cold energy, the cold energy is further conveyed to the surface air cooler group of the chamber through the heat exchange medium. And the heated heat exchange medium exchanges heat with the cooling medium in the heat exchanger group and / or at the heat exchanger group so as to reduce the temperature and obtain the cooling capacity. The temperature control system realizes gathering, transportation, storage and release of a natural cold source at night by means of the condition of natural day and night temperature difference, provides a main cold source for the system, does not need a complex compression refrigeration process, can greatly reduce the power consumption, and saves the cold cost.

Description

Technical Field

[0001] The present invention relates to the technical fields of mine heat hazard control, goaf environment regulation and phase change energy storage utilization, and particularly relates to a mine chamber temperature control system and method based on day-night cold storage and phase change regulation. Background Art

[0002] As an independent structure in the mine that meets specific functional requirements, the mine chamber ensures the coordinated operation of key links such as production, ventilation, drainage, material storage, and emergency shelter through specialized division of labor. It is an important part of the mine production system and provides strong support for the safety and efficient operation of the mine. However, with the increase in mining depth and the deepening of mechanization, the chamber environment temperature gradually deteriorates, and high temperature will significantly increase the accident rates such as chamber equipment failures, spontaneous combustion of dangerous goods, and personnel heat stress reactions. The mine heat hazard problem caused by high geothermal temperature and high mechanization has become one of the key technical problems restricting the safe production of mines in China.

[0003] As known to the applicant, the main forms of the temperature control system for mine chambers mainly include two methods: ventilation cooling and active cooling by mechanical refrigeration units. However, both of these temperature control methods have many problems, such as: the chamber cooling effect is not obvious, the initial investment is high, the cooling operation energy consumption is large, and the ability to handle sudden accidents is poor. In addition, the recovery of waste heat from mine return air and the anti-freezing of the wellhead currently mostly use independent units for operation, resulting in problems such as energy consumption superposition and complex management. In the context of green mining and efficient energy utilization in mines, how to synergistically achieve multiple goals of goaf treatment, mine solid waste disposal, and mine heat hazard prevention and control has become a technical bottleneck that the industry urgently needs to break through. Summary of the Invention

[0004] Aiming at the deficiencies of the known technologies in the background art of the present invention, the present application aims to provide a mine chamber temperature control system and method based on day-night cold storage and phase change regulation, so as to solve at least one technical problem existing in the known technologies mentioned in the background art.

[0005] In the first aspect of the embodiments of the present application, a mine roadway temperature control system based on day-night cold storage and phase change regulation is provided. The temperature control system is applied to areas where the day-night temperature difference is ≥ 10°C. The temperature control system includes: a heat exchanger group, including one or more first heat exchangers connected in parallel. The first heat exchanger has a tube side for the flow of a heat exchange medium and fins for the flow of external air. The heat exchanger group is arranged outside the mine; 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; 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 is filled with a phase change material, and a heat exchange tube group for the flow of the heat exchange medium is arranged inside the phase change filling body. The inlet of the heat exchange tube group is connected to the heat exchange medium outlet. The phase change temperature of the phase change material is between 20°C and 35°C; a distributor, arranged inside the mine, including one or more distributor inlets and a distributor outlet. The distributor inlet is connected to the outlet of the heat exchange tube group. The distributor outlet is connected to the tube side inlet of the first heat exchanger; a surface cooler group, including one or more surface coolers connected in parallel. All or part of the surface coolers are arranged in the roadway chamber. The surface cooler has a surface cooler inlet and a surface cooler outlet. The surface cooler inlet is connected to the distributor outlet. The surface cooler outlet is connected to the heat exchange medium inlet; a cooling tower, including one or more cooling units. The temperature control system further includes a return pipe. One end of the inlet of the return pipe is connected to the distributor outlet, and the other end of the outlet of the return pipe is connected to the heat exchange medium inlet. The return pipe passes through the working area of the cooling unit; wherein, the heat exchanger group and the cooling tower are configured to be able to operate independently or simultaneously.

[0006] In a possible implementation manner, the mine roadway temperature control system based on day-night cold storage and phase change regulation further includes: a second heat exchanger, arranged in the mine entrance roadway. The second heat exchanger has a tube side for the flow of a heat exchange medium and fins for the flow of external air. The tube side inlet of the second heat exchanger is connected to the distributor outlet, and the tube side outlet of the second heat exchanger is connected to the distributor inlet.

[0007] In a possible implementation manner, the mine roadway temperature control system based on day-night cold storage and phase change regulation further includes: a water tank, arranged on the ground at the highest point of the temperature control system. The water tank is connected to the liquid collector through a pressure regulating pipeline. A first multi-stage solution pump and a fifth valve are further arranged on the pressure regulating pipeline.

[0008] In a possible implementation, in the mine roadway temperature control system based on day-night cold storage and phase change regulation, the first heat exchanger further includes: an independent fan for agitating the air flow towards the fins of the first heat exchanger; a first temperature sensor disposed on the fins of the first heat exchanger for obtaining the temperature of the fins of the first heat exchanger and further controlling the rotational speed of the independent fan based on this temperature; a vibration device disposed on the fins of the first heat exchanger for vibrating the fins of the first heat exchanger to further shake off dust; an electric heating tape disposed on the fins of the first heat exchanger for heating the fins of the first heat exchanger to de-ice or defrost in winter; a louvered air valve disposed at the air inlet of the first heat exchanger, configured to open and close manually or electrically, for controlling the air flow rate and velocity towards the fins of the first heat exchanger, and further controlling the heat exchange intensity of the first heat exchanger.

[0009] In a possible implementation, in the mine roadway temperature control system based on day-night cold storage and phase change regulation, it further includes: a second temperature sensor disposed in the roadway for obtaining the temperature of the roadway; a third temperature sensor disposed inside the phase change filling body for obtaining the temperature of the phase change material.

[0010] In a possible implementation, in the mine roadway temperature control system based on day-night cold storage and phase change regulation, it further includes: a meteorological monitor disposed outside the mine for obtaining the outdoor ambient temperature, ambient humidity, and wind speed.

[0011] In a second aspect of the embodiments of the present application, there is provided a mine roadway temperature control method based on day-night cold storage and phase change regulation. This temperature control method is applied to any of the foregoing temperature control systems. The temperature control method includes: in response to the outdoor ambient temperature T at night W being lower than the phase change temperature T of the phase change material X , starting the first cold storage mode, that is, controlling the heat transfer medium to circulate between the heat exchanger group, the liquid collector, the heat exchange tube group, and the liquid distributor; in response to the temperature T of the roadway during the day G being higher than the first preset threshold, starting the cold release mode, that is, controlling the heat transfer medium to circulate between the heat exchange tube group, the liquid distributor, the surface cooler group, and the liquid collector.

[0012] In a possible implementation, the mine roadway temperature control method based on day-night cold storage and phase change regulation further includes: the conditions for starting the first cold storage mode further include all of the following: the outdoor ambient temperature T at night W being lower than the phase change temperature T of the phase change material X continuing to exceed the second preset threshold, the outdoor ambient air humidity φ W≤65%, the residual pressure of the mine ventilation system is greater than or equal to 200 Pa; and, in the first cold storage mode, based on the cold storage rate of the phase change material being greater than or equal to the third preset threshold, control the louvered air valve of the first heat exchanger to be in the open state, otherwise, control the independent fan and the louvered air valve of the first heat exchanger to be in the open state simultaneously.

[0013] In a possible implementation, the mine roadway temperature control method based on day-night cold storage and phase change regulation further includes: in response to the working time being in the daytime period, starting the second cold storage mode, that is, controlling the heat exchange medium to circulate between the heat exchange tube group, the liquid distributor, the return pipe, and the liquid collector; and when at least one of the following conditions is met, controlling the cooling tower to enter the operating state: (a) the cold storage consumption rate of the phase change filling body is greater than or equal to the fourth preset threshold of the cold storage replenishment rate; (b) the local temperature of the mine equipment in the roadway exceeds the fifth preset threshold and lasts for ten minutes or more; (c) the predicted daily heat load value of the roadway exceeds the sixth preset threshold and lasts for two hours or more; (d) the wind speed V of the mine external environment W is less than the seventh preset threshold; wherein, the cooling tower has a dry mode and a wet mode, in the dry mode, air is used as the cooling medium to exchange heat with the heat exchange medium in the return pipe, and in the wet mode, sprayed water is used as the cooling medium to exchange heat with the heat exchange medium in the return pipe; in winter or dusty weather, the cooling tower operates in the dry mode; otherwise, the cooling tower operates in the wet mode.

[0014] In a possible implementation, the mine roadway temperature control method based on day-night cold storage and phase change regulation further includes: in winter, by default, control the temperature control system to store cold in the first cold storage mode; if the temperature T of the phase change material X is greater than or equal to the eighth preset threshold or the mine emergency heat load is triggered, simultaneously control the heat exchange medium to circulate between the heat exchange tube group, the liquid distributor, the return pipe, and the liquid collector, and control the cooling tower to operate in the dry mode, where, in the dry mode, air is used as the cooling medium to exchange heat with the heat exchange medium in the return pipe; in response to the temperature T0 at the mine entrance roadway ≤ 2 °C, control at least part of the heat exchange medium to circulate between the liquid distributor and the second heat exchanger provided at the mine entrance roadway; in summer: (e) in response to the working time being between 23:00 - 6:00 or the outdoor ambient temperature T W ≤ 5 °C, control the temperature control system to store cold in the first cold storage mode; (f) in response to the working time being between 10:00 - 18:00 or the outdoor ambient temperature T W≥25°C, control the temperature control system to store cold in the second cold storage mode, that is, control the heat exchange medium to circulate between the heat exchange tube group, the liquid distributor, the return pipe and the liquid collector. The cooling tower operates in the wet mode, and in the wet mode, spray water is used as the cooling medium to exchange heat with the heat exchange medium in the return pipe; (g) In response to the working hours being between 06:00 - 10:00 and 18:00 - 23:00 or the outdoor ambient temperature T W Between 5°C and 25°C, control the temperature control system to store cold in the first cold storage mode and the second cold storage mode simultaneously.

[0015] At least one embodiment of the present invention can have the beneficial effects of at least one of the following aspects:

[0016] (1) Skillfully leveraging the natural condition of the natural day-night temperature difference, it realizes the capture, transportation, storage, and release of natural cold sources at night, without the need for a complex compression refrigeration process, which can significantly reduce power consumption and save cold usage costs. It is beneficial to solve the practical problems in the independent temperature control requirements of deep mine chambers, and has certain significance for promoting mine safety, green mining, and the application of day-night cold storage technology in mines in terms of energy conservation and emission reduction.

[0017] (2) The "night storage and day release" phase change cold storage technology can not only be applied to the independent temperature control of mine chambers, but also be extended to engineering practical situations such as the temperature and humidity control of mine tunneling faces and wellhead anti-freezing. The phase change cold storage library can be converted into a phase change heat storage library in winter, and can be combined with green energy sources such as geothermal energy and solar energy to achieve green energy use for winter heating and wellhead anti-freezing heating.

[0018] (3) The environment in coal mines is harsh, with a lot of dust, high humidity, narrow space and a certain gas concentration, which requires extremely high equipment tolerance. Components such as evaporators and condensers of traditional ice storage air conditioners are prone to dust accumulation and corrosion, and need to be shut down for maintenance frequently, which not only affects normal use, but also increases operation and maintenance costs and safety risks. The phase change cold storage device has fully considered the underground working conditions at the beginning of its design. Therefore, the outer shell is made of rust-proof, dust-proof and explosion-proof materials, the internal heat exchange components have a simple structure and are easy to clean, and the modular design is more convenient for quickly replacing faulty components, greatly reducing the workload and difficulty of maintenance, and can more flexibly adapt to the harsh environment in coal mines.

[0019] (4) Relying on the natural phenomenon of large day-night temperature difference and taking day-night cold storage / release as the operation strategy, it forms a mode of capturing, transporting, storing and utilizing natural cold sources in the mining area, and realizes stable cold supply and release during disasters. When the power grid is at a low electricity consumption valley and the electricity price is low, start the refrigeration equipment, effectively utilize the low-cost night electricity while reducing the power supply pressure during the peak period of the day's power grid. Through the coordinated operation of the finned tube heat exchanger and the cooling tower and its operation control logic, it effectively ensures the intelligent control and effective regulation of the system in cold / heat collection, storage and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments 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, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Schematic diagram of a mine roadway temperature control system based on day-night cold storage and phase change regulation provided by an embodiment of the present application;

[0022] Figure 2 Figure 1 Cross-sectional view of the phase change filling body in the shown temperature control system;

[0023] Figure 3 Schematic diagram of the control logic of a mine roadway temperature control method based on day-night cold storage and phase change regulation provided by an embodiment of the present application;

[0024] Figure 4 Schematic diagram of the control logic of a mine roadway temperature control method based on day-night cold storage and phase change regulation provided by an embodiment of the present application;

[0025] Wherein: 1, 2, 3, 4 - phase change filling body; 5 - phase change material; 6 - surface of the mine roadway; 7, 8 - chambers; 9, 10, 11, 12 - surface coolers; 13, 14, 15, 16 - first heat exchangers; 17 - fins; 18 - second heat exchanger; 19 - mine entrance roadway; 20 - water tank; 21 - cooling tower; 22 - liquid collector; 23 - liquid distributor; 24 - ground outside the mine; 25 - meteorological monitor; 26 - second temperature sensor; 27 - first multi-stage solution pump; 28 - second multi-stage solution pump; 29 - first valve; 30 - first check valve; 31 - second check valve; 32 - second valve; 33 - third valve; 34 - third check valve; 35 - fourth check valve; 36 - fourth valve; 37 - third multi-stage solution pump; 38 - fifth valve; 39 - sixth valve; 40 - seventh valve; 41 - fourth multi-stage solution pump; 42 - eighth valve; 43 - ninth valve; 44 - fifth check valve; 45 - sixth check valve; 46 - tenth valve; 47 - eleventh valve; 48 - seventh check valve; 49 - eighth check valve; 50 - twelfth valve; 51 - thirteenth valve; 52 - fifth multi-stage solution pump; 53 - sixth multi-stage solution pump; 54 - seventh multi-stage solution pump; 55 - eighth multi-stage solution pump; 56 - ninth multi-stage solution pump; 57 - third temperature sensor; 58 - heat exchange tube bundle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are 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 limiting the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, it should be noted that the meaning of "plurality" is two or more unless otherwise specifically defined.

[0028] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. 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 that can communicate with each other; 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 can be understood according to specific circumstances.

[0029] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal thickness of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal thickness of the first feature is less than that of the second feature.

[0030] 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. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0031] Figure 1 is a schematic diagram of a mine roadway temperature control system based on day-night cold storage and phase change regulation provided by an embodiment of the present application; Figure 2 is Figure 1 a cross-sectional view of the phase change filling bodies 1, 2, 3, and 4 in the temperature control system shown.

[0032] Referring to Figure 1 and Figure 2, a mine roadway temperature control system based on day-night cold storage and phase change regulation. The temperature control system is applied to areas with a day-night temperature difference ≥ 10°C and includes: a heat exchanger group, including one or more parallel first heat exchangers 13, 14, 15, 16. The first heat exchangers 13, 14, 15, 16 have a tube side for the heat exchange medium to flow through and fins 17 for the external air to flow through. The heat exchanger group is arranged outside the mine; a liquid collector 22, 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 13, 14, 15, 16. The liquid collector 22 is arranged inside the mine; a phase change material filling body group, arranged inside the mine, including one or more parallel phase change filling bodies 1, 2, 3, 4. The phase change filling bodies 1, 2, 3, 4 are filled with a phase change material 5, and heat exchange tube groups 58 for the heat exchange medium to flow through are arranged inside the phase change filling bodies 1, 2, 3, 4. The inlets of the heat exchange tube groups 58 are connected to the heat exchange medium outlets. The phase change temperature of the phase change material 5 is between 20°C and 35°C; a liquid distributor 23, arranged inside the mine, including one or more liquid distributor inlets and a liquid distributor outlet. The liquid distributor inlets are connected to the outlets of the heat exchange tube groups 58, and the liquid distributor outlet is connected to the tube side inlets of the first heat exchangers 13, 14, 15, 16; a surface cooler group, including one or more parallel surface coolers 9, 10, 11, 12. All or part of the surface coolers 9, 10, 11, 12 are arranged inside the roadway. The surface coolers 9, 10, 11, 12 have surface cooler 9, 10, 11, 12 inlets and surface cooler 9, 10, 11, 12 outlets. The surface cooler 9, 10, 11, 12 inlets are connected to the liquid distributor outlet, and the surface cooler 9, 10, 11, 12 outlets are connected to the heat exchange medium inlets; a cooling tower 21, including one or more cooling units. The temperature control system further includes a return pipe. One end of the inlet of the return pipe is connected to the liquid distributor outlet, and the other end of the outlet of the return pipe is connected to the heat exchange medium inlet. The return pipe passes through the working area of the cooling unit; wherein, the heat exchanger group and the cooling tower 21 are configured to be able to operate independently respectively or operate simultaneously.

[0033] According to the embodiment of the present invention, the heat exchange medium in the pipeline can flow controllably in the heat exchanger group, the liquid collector 22, the heat exchange tube groups 58 in the phase change material filling body group, the liquid distributor 23, the surface cooler group, and the return pipe. The cold quantity stored by the phase change material 5 in the phase change material filling body group can be transferred to the inside of the roadway through the heat exchange medium to achieve the purpose of cooling it. The condition for releasing the cold quantity can be the temperature T inside the roadway GHigher than the first preset threshold (e.g., 26 °C), and this condition is usually reached during the day or daytime. The cold source of the entire temperature control system has two parts. One is that when the heat exchange medium flows through the heat exchanger group, it obtains cold from the external environment through air cooling or natural cooling. This way of obtaining cold is controlled to occur at night when the temperature is lower, and it can also be carried out as appropriate in the early morning or evening. The other is to operate the cooling tower 21. The heat exchange medium flowing through the working area of the cooling tower 21 through the return pipe dissipates heat and obtains cold here. The cooling tower 21 can provide cold in the form of spray water or air cooling. This way of obtaining cold can be operated during the day and in extreme weather, and it can also be carried out in cooperation with the first method as appropriate in the early morning or evening. Regardless of the source of cold, it will first be stored by the phase change material 5 in the phase change material filling body group and provided when needed. Experiments have shown that in areas where the day-night temperature difference ≥ 10 °C, the cold from the first source mentioned above can account for 50%-70% of the cold consumed or required by the system (in areas with a larger day-night temperature difference, this proportion will be higher).

[0034] The advantages of the embodiments of the present application are as follows: By leveraging the condition of the natural day-night temperature difference, the capture, transportation, storage, and release of natural cold sources at night are realized, providing the main cold source for the system. Without a complex compression refrigeration process, it can significantly reduce power consumption and save cold usage costs. It is beneficial to solve the practical problems in the independent temperature control requirements of deep mine chambers, and has certain energy-saving and emission-reduction significance for promoting safe and green mining in mines and the application of day-night cold storage technology in mines. At the same time, the cooling tower 21 is also configured to operate alone or simultaneously with the heat exchanger group during the day, in extreme weather, under extreme working conditions, when the cold storage capacity and cold replenishment capacity are insufficient, to provide cold for the system to ensure the stable operation of the entire system.

[0035] Appendix Figure 1 The number of the first heat exchangers 13, 14, 15, 16, the phase change filling bodies 1, 2, 3, 4, and the surface coolers 9, 10, 11, 12 in the figure is four each, but this is only illustrative. In actual use, each can be set to more or fewer according to actual needs, and this is completely feasible for the embodiments of the present application.

[0036] The first heat exchangers 13, 14, 15, 16 are arranged in parallel through pipes to ensure that the inlet and outlet flows are basically the same. The first heat exchangers 13, 14, 15, 16 can adopt the form of a serpentine single pipe with fins 17 outside. The heat exchange medium flows through the tube side, and the air flows through the fins 17. Dust removal nets, self-cleaning filters and independent fans are arranged at the inlets to ensure the functions of dust removal, sand filtering and forced heat exchange when cooling the heat exchange medium with air cooling at night. And louvered air valves are arranged outside the first heat exchangers 13, 14, 15, 16 (at the air inlet or outlet), and the opening and closing angles of the louvers are adjusted through electric or manual control to adjust the flow rate and velocity of the external air, so as to control the heat exchange intensity of the heat exchanger.

[0037] The cooling tower 21 can be one or more parallel cooling tower 21 units, and redundant control or partial load regulation can be realized through valve switching to ensure the provision of a standby cold source when the cold release is incomplete during the day or to accelerate the cold storage process at night. Considering the climatic characteristics of the northwest region (such as strong wind and sand, dryness, low temperature, etc.), a cooling tower 21 that is dust-proof, low-temperature resistant, corrosion-resistant and highly water-saving needs to be selected. A metal filter net can be added inside to strengthen the dust-proof design. During the sandstorm warning period, the self-cleaning mode of the cooling tower 21 is enabled. In winter, anti-freezing measures need to be taken to avoid the risk of icing. Electric heating tapes (maintaining ≥5°C) and drain valves can be configured to prevent the heat exchange medium from freezing when the machine is stopped and improve the anti-freezing and dry operation capabilities. Different types of cooling towers 21 (closed dry cooling towers, evaporative cooling towers) can be selected according to different regions.

[0038] As Figure 1 shown, the liquid collector 22 is arranged at the top of the mining area roadway. The material is corrosion-resistant and high-pressure-resistant steel. Placed in the mining area roadway, the outer shell is attached with rubber and plastic cotton for heat preservation. Its main function is to collect the heat exchange media from the heat exchanger group and the surface cooler group and evenly distribute the heat exchange media into the heat exchange tube group 58.

[0039] The phase change filling bodies 1, 2, 3, 4 are arranged in the mined-out area of the mine. The phase change filling bodies 1, 2, 3, 4 are arranged in parallel with each other and filled with pure phase change materials 5 with appropriate phase change temperatures. Heat exchange tube groups 58 are arranged inside, and flow guiding plates are set to optimize the fluid distribution and improve the charging and discharging cold efficiency of the phase change material 5. The inner walls of the phase change filling bodies 1, 2, 3, 4 can be moisture-proof treated, and the outer walls adopt good heat insulation measures to reduce the loss of cold.

[0040] Phase change material 5 preferably uses materials with suitable phase change temperature, large phase change latent heat, stable chemical properties and good economic efficiency (such as organic paraffin, inorganic hydrated salts, etc.). Taking into account the characteristics of climate change in some areas with severe cold in winter and high temperature in summer, the phase change temperature should meet the needs of these two seasons, and the phase change temperature should be 8-12℃ lower than the maximum daytime temperature (for example, in the northwest summer, the maximum daytime temperature is 40℃, so a phase change material 5 with a phase change temperature of 28-32℃ is selected), and 3-5℃ higher than the minimum nighttime temperature (if the minimum nighttime temperature in summer is 18℃, the solidification temperature is set to 21-23℃) to ensure the efficiency of cold storage and cold release. Therefore, a phase change material 5 with a phase change temperature between 20℃ and 35℃ can be selected to absorb cold energy at night or when electricity consumption is low, and phase change storage is carried out, and cold energy is released when chambers 7 and 8 need to be cooled.

[0041] The heat exchange tube group 58 is preferably made of a plastic material that is resistant to high temperature, high pressure, low temperature, corrosion, chemically stable, has good thermal conductivity, and has low flow resistance. Figure 2 As shown schematically, the heat exchange tube group 58 is composed of four parallel single straight tubes, with the tube spacing designed according to the thermal conductivity of the material, and is respectively placed at the upper right, lower right, upper left and lower left of the phase change filling bodies 1, 2, 3, and 4.

[0042] Liquid distributor 23 is installed at the bottom of the mine tunnel. It is preferably made of corrosion-resistant steel. Rubber or plastic insulation can be applied to the exterior of the housing. It features one or more distributor inlets and one or more distributor outlets. Its primary function is to collect heat exchange medium from the heat exchange tube group and the second heat exchanger 18 and evenly distribute it to the second heat exchanger 18, the surface cooler group, and the heat exchanger group.

[0043] The surface cooler group is placed on the mining face or chambers 7, 8, wherein at least some of the surface coolers 9, 10, 11, 12 are arranged in chambers 7, 8. The surface coolers 9, 10, 11, 12 are in the form of spiral baffles, with dust-proof curtains installed on the outside and rollers installed on the bottom for easy movement.

[0044] The heat exchange medium preferably has a low freezing point, anti-freezing properties (suitable for cold storage in cold environments), a high evaporation point (needed to withstand the high temperatures of mines), is non-toxic, inexpensive, and has no or low corrosion. The heat exchange medium resides within a closed pipe and circulates throughout the system through a circulation pipeline. It indirectly exchanges heat with the surrounding phase change material 5 through the pipe walls, ensuring physical isolation between the heat exchange medium and the phase change material 5 to prevent contamination or chemical reactions.

[0045] like Figure 1As shown, in a possible implementation, the mine roadway temperature control system based on day-night cold storage and phase change regulation further includes: a second heat exchanger 18, which is arranged in the mine entrance roadway 19. The second heat exchanger 18 has a tube side for the heat transfer medium to flow through and fins 17 for the external air to flow through. The inlet of the tube side of the second heat exchanger 18 is connected to the outlet of the liquid distributor, and the inlet of the tube side of the second heat exchanger 18 is connected to the inlet of the liquid distributor.

[0046] The second heat exchanger 18 can be of the same type as the first heat exchangers 13, 14, 15, 16. It is arranged in the mine entrance roadway 19 for winter wellhead anti-freezing and auxiliary cold storage. That is, in winter, the heat energy stored inside the phase change material 5 is used to heat the wellhead air to above 4°C. Also, the night auxiliary cold storage mode can be turned on. When the mine return air temperature is relatively low (such as <20°C), the cold quantity can be supplemented through the second heat exchanger 18.

[0047] As Figure 1 As shown, in a possible implementation, the mine roadway temperature control system based on day-night cold storage and phase change regulation further includes: a water tank 20, which is arranged on the ground at the highest point of the temperature control system. The water tank 20 is connected to the liquid collector 22 through a pressure regulating pipeline. A first multi-stage solution pump 27 and a fifth valve 38 are also arranged on the pressure regulating pipeline.

[0048] The main function of the water tank 20 is to discharge the air in the system. When the volume expands or contracts due to temperature changes, the water volume can be supplemented in time to ensure the system pressure stability and prevent pipeline rupture or air blockage. Its liquid level should be maintained between 1 / 3 and 2 / 3 of the internal height of the water tank 20.

[0049] In a possible implementation, in the mine roadway temperature control system based on day-night cold storage and phase change regulation, which is not shown in the drawings, the first heat exchangers 13, 14, 15, 16 further include: an independent fan for agitating air to flow towards the fins 17 of the first heat exchangers 13, 14, 15, 16; a first temperature sensor disposed on the fins 17 of the first heat exchangers 13, 14, 15, 16 for obtaining the temperature of the fins 17 of the first heat exchangers 13, 14, 15, 16 and further controlling the rotational speed of the independent fan based on this temperature; a vibration device disposed on the fins 17 of the first heat exchangers 13, 14, 15, 16 for vibrating the fins 17 of the first heat exchangers 13, 14, 15, 16 to further shake off dust; an electric heating tape disposed on the fins 17 of the first heat exchangers 13, 14, 15, 16 for heating the fins 17 of the first heat exchangers 13, 14, 15, 16 to de-ice or defrost in winter; a louvered air valve disposed at the air inlets of the first heat exchangers 13, 14, 15, 16, configured to open and close manually or electrically, for controlling the air flow rate and velocity flowing towards the fins 17 of the first heat exchangers 13, 14, 15, 16 and further controlling the heat exchange intensity of the first heat exchangers 13, 14, 15, 16.

[0050] In a possible implementation, dust removal nets and self-cleaning filters are provided at the inlets of the first heat exchangers 13, 14, 15, 16 to play the role of dust removal and sand filtering when cooling the heat exchange medium with air cooling at night.

[0051] Those skilled in the art can understand that in specific implementation, according to specific working conditions (such as mine environmental temperature, humidity, wind speed, dust concentration, refrigerant type, etc.), targeted design optimizations can be carried out on the fin 17 spacing, fin 17 type (corrugated, flat), fin 17 arrangement form (in-line arrangement, staggered arrangement), etc. The heat exchange capacity can also be flexibly adjusted by increasing or decreasing the number of fin 17 tube rows to adapt to the load changes of cold storage / cold release in different seasons, ensuring the reliability and heat exchange efficiency of long-term operation.

[0052] As Figure 1 shown, in a possible implementation, in the mine roadway temperature control system based on day-night cold storage and phase change regulation, it further includes: a second temperature sensor 26 disposed in the chambers 7, 8 for obtaining the temperature of the chambers 7, 8; a third temperature sensor 57 disposed inside the phase change filling bodies 1, 2, 3, 4 for obtaining the temperature of the phase change material 5.

[0053] In this embodiment, the start or stop of cold storage and cold release can be based on the temperatures of the chambers 7 and 8 obtained by the second temperature sensor 26 and the third temperature sensor 57, the temperature of the phase change material 5, the outdoor ambient temperature, and the phase change temperature of the phase change material 5. Specifically, at night, when the air temperature drops significantly and the outdoor ambient temperature T W is lower than the phase change temperature T X of the phase change material 5, the cold storage module is started. At this time, the external ambient cold is transferred to the phase change material 5 through the first heat exchangers 13, 14, 15, and 16. Specifically, the heat transfer medium flows through the surfaces of the first heat exchangers 13, 14, 15, and 16 to perform natural convection heat exchange with the low-temperature air. The cooled heat transfer medium enters the heat exchange tube groups 58 in the phase change filling bodies 1, 2, 3, and 4 through pipelines to perform indirect heat exchange with the phase change material 5, so that the phase change material 5 absorbs cold and solidifies for cold storage. During the day, when the temperature T G of the chambers 7 and 8 rises to the set temperature upper limit, the cold release module is started. At this time, the phase change material 5 in the phase change filling bodies 1, 2, 3, and 4 releases cold and melts for cooling. Specifically, the cold energy stored in the phase change filling bodies 1, 2, 3, and 4 performs heat exchange with the heat transfer medium in the heat exchange tube groups 58. The cooled heat transfer medium is sent to the distributor 23, and is distributed by the distributor 23 to the surface coolers 9, 10, 11, and 12 with the temperature of T G in the mining face or the chambers 7 and 8 for temperature reduction. Exemplarily, the start condition can be set as T G > 26°C; when the temperature T G of the working face of the chambers 7 and 8 is ≤ 24°C, the cold release is stopped to reduce unnecessary cold energy consumption and ensure that the temperature of the working face or the chambers 7 and 8 is stably within the human comfort range. The heated heat transfer medium will be pumped to the heat exchanger group for air-cooled heat exchange, and the cycle is repeated to complete the replacement of cold energy.

[0054] In areas with lower temperatures at night, the phase change material 5 can release heat to the environment only by natural convection to complete the solidification cold storage process, without the forced heat dissipation of the cooling tower 21, which greatly saves the operation and maintenance costs of the cooling tower 21. However, if the external air temperature, humidity, wind speed and other conditions are not conducive to natural heat exchange, or the heat load of the mine is large, the cold demand during the day is high, and at the same time, the cold storage redundancy design needs to be considered to ensure that the cold storage capacity of the system is sufficient to support the demand for 5 days to cope with the short-term cold supply. Therefore, it is necessary to use the cooling tower 21 to improve the cold storage speed and efficiency through forced convection (automatically switch to the forced heat exchange mode of the heat exchanger group during the maintenance period of the cooling tower 21).

[0055] In this embodiment, whether the heat exchanger group or the cooling tower 21 stores cold is comprehensively determined according to factors such as the external temperature, humidity, wind speed, sand and dust conditions, and cold storage demand. For normal day and night: the first heat exchangers 13, 14, 15, 16 are dominant for cooling, and the cooling tower 21 is on standby. The basic cold storage can be completed by using natural convection at night through the first heat exchangers 13, 14, 15, 16 (meeting 80% of the load demand); for extreme weather (such as sand and dust, heavy rain): the louvered air valve is closed, and the cooling tower 21 operates independently. When the cold stored in the phase change material 5 < 3 days' demand, the cooling tower 21 needs to be forced to start and enter the full-power operation mode; when the stored cold is ≤ 4 days' demand, the first heat exchangers 13, 14, 15, 16 are preferably used to turn on the fan mode, and the standby cooling tower 21 module is used. In addition, if energy storage needs to be completed within a short night period or there is a high-temperature warning, it will automatically switch to the "cooling tower 21 priority" mode to ensure redundant cold storage in the short term.

[0056] As Figure 1 shown, in a possible implementation manner, in the mine roadway temperature control system based on day-night cold storage and phase change regulation, it further includes: a meteorological monitor 25, arranged outside the mine, for obtaining the outdoor environmental temperature T W , environmental humidity φ W and wind speed V W .

[0057] The system can judge the weather conditions based on the outdoor environmental temperature T W , environmental humidity φ W and wind speed V W collected by the meteorological monitor 25, such as whether it is extreme weather (such as sand and dust weather, heavy rain weather, etc.), so that the temperature control system can make adaptive adjustments.

[0058] Figure 3 is a schematic diagram of the control logic of the mine roadway temperature control method based on day-night cold storage and phase change regulation provided by an embodiment of the present application; Figure 4 is a schematic diagram of the control logic of the mine roadway temperature control method based on day-night cold storage and phase change regulation provided by another embodiment of the present application.

[0059] In the second aspect of the embodiments of the present application, a mine roadway temperature control method based on day-night cold storage and phase change regulation is provided. The temperature control method is applied to any of the foregoing temperature control systems. The temperature control method includes: in response to the outdoor environmental temperature T W at night being lower than the phase change temperature T X of the phase change material 5, starting the first cold storage mode, that is, controlling the heat exchange medium to circulate between the heat exchanger group, the liquid collector 22, the heat exchange tube group 58 and the liquid distributor 23; in response to the temperature T GAbove the first preset threshold, the cold release mode is started, that is, the heat exchange medium is controlled to circulate between the heat exchange tube group 58, the liquid distributor 23, the surface cooler group and the liquid collector 22.

[0060] Specifically, as Figure 3 shown, at night, first obtain the outdoor ambient temperature T W and the phase change temperature T X of the phase change material 5. If T W ≤T X is not satisfied, then cold storage or cold release is not carried out. Otherwise, control the first cold storage mode of the temperature system to start cold storage. That is, control the heat exchange medium to circulate between the heat exchanger group, the liquid collector 22, the heat exchange tube group 58 and the liquid distributor 23. At this time, only the heat exchanger group serves as the cold source of the system.

[0061] Furthermore, when T W ≤T X is satisfied, it can also be further determined whether it is extreme weather (such as sandstorm weather, heavy rain weather, etc.). If it is not extreme weather, start cold storage in the first cold storage mode; otherwise, stop starting cold storage in the first cold storage mode and switch to the second cold storage mode for cold storage, that is, control the heat exchange medium to circulate between the heat exchange tube group 58, the liquid distributor 23, the return pipe and the liquid collector 22, and operate the cooling tower 21. At this time, the heat exchanger group does not provide the cold source, and the cold source of the system is provided by the cooling tower 21.

[0062] During the day, obtain the temperature T G of the chamber. If T G > the first preset threshold, start the cold release mode, that is, control the heat exchange medium to circulate between the heat exchange tube group 58, the liquid distributor 23, the surface cooler group and the liquid collector 22; otherwise, stop starting cold storage in the first cold storage mode and switch to the second cold storage mode for cold storage.

[0063] Furthermore, before the foregoing judgment step, it can also be determined whether T G > 24°C is satisfied. If not, it means that the system neither needs cold release nor cold storage. In this embodiment, the first preset threshold is greater than 24°C.

[0064] It should be noted that the first preset threshold is a temperature value that can be artificially set and can be the temperature at which the human body feels comfortable, such as 26°C.

[0065] In a possible implementation manner, the mine chamber temperature control method based on day-night cold storage and phase change regulation further includes: the conditions for starting the first cold storage mode also include all of the following: the outdoor ambient temperature T W at night is lower than the phase change temperature T XContinuously exceeding the second preset threshold, the outdoor ambient air humidity φ W ≤65%, and the residual pressure of the mine ventilation system is greater than or equal to 200 Pa; and, in the first cold storage mode, when the cold storage rate based on the phase change material 5 is greater than or equal to the third preset threshold, control the louvered air valves of the first heat exchangers 13, 14, 15, 16 to be in the open state, otherwise, control the independent fans and louvered air valves of the first heat exchangers 13, 14, 15, 16 to be in the open state simultaneously.

[0066] It should be noted that the second preset threshold is a manually set time value, such as 6 hours. One of the conditions for starting the first cold storage mode is limited to the outdoor ambient air humidity φ W ≤65%. The significance is that when the humidity exceeds 65%, there is a possibility of attached condensed water and / or frosting. At this time, the heat exchange efficiency of the first heat exchangers 13, 14, 15, 16 will decrease. When the mine ventilation system has a residual pressure greater than or equal to 200 Pa, it can drive the air to flow naturally through the heat exchanger group.

[0067] Furthermore, in the state of cold storage in the first cold storage mode, under normal circumstances, natural convection can be relied on, that is, the louvered air valve is opened to full open (opening degree > 80%), and the fan does not need to be turned on to complete heat exchange; but when the cold storage rate of the phase change material 5 < 5 °C / h (i.e., the third preset threshold, which can be manually set), forced convection mode can be further assisted, that is, the fan is started for forced convection heat exchange to achieve the required cooling effect.

[0068] In a possible implementation, the mine roadway temperature control method based on day-night cold storage and phase change regulation further includes: in response to the working time being in the daytime period, starting the second cold storage mode, that is, controlling the heat exchange medium to circulate between the heat exchange tube group 58, the liquid distributor 23, the return pipe, and the liquid collector 22; and when at least one of the following conditions is met, controlling the cooling tower 21 to enter the operating state: (a) the cold storage consumption rate of the phase change filling bodies 1, 2, 3, 4 is greater than or equal to the fourth preset threshold of the cold storage replenishment rate; (b) the local temperature of the mine equipment in the roadway exceeds the fifth preset threshold and lasts for ten minutes or more; (c) the predicted value of the daily average heat load of the roadway exceeds the sixth preset threshold and lasts for two hours or more; (d) the wind speed V of the mine external environment W is less than the seventh preset threshold; wherein, the cooling tower 21 has a dry mode and a wet mode. In the dry mode, air is used as the cooling medium to exchange heat with the heat exchange medium in the return pipe, and in the wet mode, spray water is used as the cooling medium to exchange heat with the heat exchange medium in the return pipe; in winter or dusty weather, the cooling tower 21 operates in the dry mode; otherwise, the cooling tower 21 operates in the wet mode.

[0069] It should be noted that the fourth preset threshold, the fifth preset threshold, the sixth preset threshold, and the seventh preset threshold can all be set manually. Schematically, the fourth preset threshold can be set to 150%, the fifth preset threshold can be set to 50 °C, the sixth preset threshold can be selected as an empirical value or a predicted value according to the actual situation of the mine, and the seventh preset threshold can be set to 1 m / s.

[0070] When any of the above conditions is met, the second cold storage mode is started.

[0071] [[ID=J6]]In a possible implementation, the mine roadway temperature control method based on day-night cold storage and phase change regulation further includes: in winter, by default, controlling the temperature control system to store cold in the first cold storage mode; if the temperature T of the phase change material 5 X is greater than or equal to the eighth preset threshold or when the mine emergency heat load is triggered, simultaneously controlling the heat exchange medium to circulate between the heat exchange tube group 58, the liquid distributor 23, the return pipe, and the liquid collector 22, and controlling the cooling tower 21 to operate in the dry mode, where in the dry mode, air is used as the cooling medium to exchange heat with the heat exchange medium in the return pipe; in response to the temperature T0 at the mine entrance roadway 19 ≤ 2 °C, controlling at least part of the heat exchange medium to circulate between the liquid distributor 23 and the second heat exchanger 18 provided at the mine entrance roadway 19; in summer: (e) in response to the working hours being between 23:00 and 6:00 or the outdoor ambient temperature T W ≤ 5 °C, controlling the temperature control system to store cold in the first cold storage mode; (f) in response to the working hours being between 10:00 and 18:00 or the outdoor ambient temperature T W ≥ 25 °C, controlling the temperature control system to store cold in the second cold storage mode, that is, controlling the heat exchange medium to circulate between the heat exchange tube group 58, the liquid distributor 23, the return pipe, and the liquid collector 22, and the cooling tower 21 to operate in the wet mode, where in the wet mode, spray water is used as the cooling medium to exchange heat with the heat exchange medium in the return pipe; (g) in response to the working hours being between 06:00 and 10:00 and 18:00 and 23:00 or the outdoor ambient temperature T W is between 5 °C and 25 °C, controlling the temperature control system to store cold in both the first cold storage mode and the second cold storage mode simultaneously.

[0072] Furthermore, in the above-mentioned condition (e), the temperature control system mainly stores cold through the heat exchanger group and supplements it with the cooling tower 21; in the above-mentioned condition (f), the temperature control system supplements cold storage through the heat exchanger group and mainly stores cold with the cooling tower 21; and in the above-mentioned condition (g), both the first cold storage mode and the second cold storage mode store cold at half load.

[0073] Furthermore, in the above-mentioned operating conditions (e), (f), and (g), when any one of the heat exchanger group and the cooling tower 21 fails, the other is controlled to operate at full load to provide cooling for the system.

[0074] Furthermore, in a possible embodiment, the specific control method also takes into account the cooling capacity stored in the phase change material 5. When the cooling capacity stored in the phase change material 5 is less than the supply for three days, the cooling tower 21 needs to be forced to start operating in the full-power mode to supplement the cooling urgently and rapidly; when the cooling capacity stored in the phase change material 5 is less than or equal to the supply for four days, the heat exchanger group is given priority and the fan mode is turned on for cooling, and the cooling tower 21 is used as a backup cooling source. If the cooling capacity stored in the phase change material 5 is greater than the supply for four days, it can be considered that the system does not need to supplement the cooling temporarily. In addition, if energy storage needs to be completed during a short nighttime period or there is a high-temperature warning, it will automatically switch to the "cooling tower 21 priority" mode to ensure short-term cooling capacity redundancy reserve.

[0075] As Figure 1 shown, in addition to the components or features already described above, the embodiments of the present application further include the mine roadway surface 6, the ground outside the mine 24, the second multi-stage solution pump 28, the first valve 29, the first check valve 30, the second check valve 31, the second valve 32, the third valve 33, the third check valve 34, the fourth check valve 35, the fourth valve 36, the third multi-stage solution pump 37, the sixth valve 39, the seventh valve 40, the fourth multi-stage solution pump 41, the eighth valve 42, the ninth valve 43, the fifth check valve 44, the sixth check valve 45, the tenth valve 46, the eleventh valve 47, the seventh check valve 48, the eighth check valve 49, the twelfth valve 50, the thirteenth valve 51, the fifth multi-stage solution pump 52, the sixth multi-stage solution pump 53, the seventh multi-stage solution pump 54, the eighth multi-stage solution pump 55, the ninth multi-stage solution pump 56. Among them, the mine roadway surface 6 and the ground outside the mine 24 can be used to arrange the components or features configured in the mine and outside the mine respectively.

[0076] As is well known to those skilled in the art, the function of a pump is to provide power and pressure for a fluid, and it usually has two states: running and stopping; the function of a valve is to allow or cut off the fluid, and it usually has two states: conducting and blocking. The positions and connection relationships of the various pumps and valves in the embodiments of the present application are as shown in the attached Figure 1 figure. Those skilled in the art can understand that based on the disclosed content of the embodiments of the present application, these pumps and valves, in cooperation with the components or features already described above, can achieve the invention purpose and corresponding technical effects of any of the foregoing embodiments; in other words, based on the disclosed content of the present application, the operating logic of these pumps and valves is obvious to those skilled in the art.

[0077] For those skilled in the art, it is obvious that the present application is not limited to the details of the above-mentioned 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, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present application.

Claims

1. A mine roadway temperature control system based on day-night cold storage and phase change regulation, characterized in that, The temperature control system is applied to areas where the day-night temperature difference ≥ 10°C, and the temperature control system includes: A heat exchanger group, including one or more first heat exchangers (13, 14, 15, 16) connected in parallel. The first heat exchangers (13, 14, 15, 16) have a tube side for the heat transfer medium to flow through and fins (17) for the external air to flow through. The heat exchanger group is arranged outside the mine; A liquid collector (22), including one or more heat transfer medium inlets and one or more heat transfer medium outlets. The heat transfer medium inlets are connected to the tube side outlets of the first heat exchangers (13, 14, 15, 16), and the liquid collector (22) 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 bodies are filled with a phase change material (5), and heat exchange tube groups (58) for the heat transfer medium to flow through are arranged inside the phase change filling bodies (1, 2, 3, 4). The inlets of the heat exchange tube groups (58) are connected to the heat transfer medium outlets, and the phase change temperature of the phase change material (5) is between 20°C and 35°C; A liquid distributor (23), arranged inside the mine, including one or more liquid distributor inlets and a liquid distributor outlet. The liquid distributor inlets are connected to the outlets of the heat exchange tube groups (58), and the liquid distributor outlet is connected to the tube side inlets of the first heat exchangers (13, 14, 15, 16); A surface cooler group, including one or more surface coolers (9, 10, 11, 12) connected in parallel. All or part of the surface coolers (9, 10, 11, 12) are arranged inside the chambers (7, 8). The surface coolers (9, 10, 11, 12) have surface cooler inlets and surface cooler outlets. The surface cooler inlets are connected to the liquid distributor outlet, and the surface cooler outlets are connected to the heat transfer medium inlets; A cooling tower (21), including one or more cooling units. The temperature control system further includes a return pipe. The inlet end of the return pipe is connected to the liquid distributor outlet, and the outlet end of the return pipe is connected to the heat transfer medium inlet. The return pipe passes through the working area of the cooling unit; Wherein, the heat exchanger group and the cooling tower are configured to be able to operate independently respectively or operate simultaneously.

2. The temperature control system for mine roadway according to claim 1, which is based on day-night cold storage and phase change regulation, is characterized in that It further includes: A second heat exchanger (18), arranged in the mine entrance roadway (19). The second heat exchanger (18) has a tube side for the heat transfer medium to flow through and fins for the external air to flow through. The tube side inlet of the second heat exchanger is connected to the liquid distributor outlet, and the tube side outlet of the second heat exchanger is connected to the liquid distributor inlet.

3. The mine roadway temperature control system based on day-night cold storage and phase change regulation according to claim 2, characterized in that, It further includes: A water tank (20), arranged on the ground at the highest point of the temperature control system. The water tank (20) is connected to the liquid collector (22) through a pressure regulating pipeline. A first multi-stage solution pump (27) and a fifth valve (38) are further arranged on the pressure regulating pipeline.

4. The mine roadway temperature control system based on day-night cold storage and phase change regulation according to claim 3, wherein, The first heat exchanger further includes: An independent fan for agitating air to flow towards the fins of the first heat exchanger; a first temperature sensor, disposed on a fin of the first heat exchanger, for obtaining a temperature of the fin of the first heat exchanger and further controlling a rotation speed of the independent fan based on the temperature; a vibration device, disposed on the fins of the first heat exchanger, for vibrating the fins of the first heat exchanger to further shake off dust; an electric heating belt, provided on the fins of the first heat exchanger, for heating the fins of the first heat exchanger for deicing or defrosting in winter; The louver-type air valve is arranged at the air outlet of the first heat exchanger and is configured to be opened and closed manually or electrically to control the air flow and flow rate flowing to the fins of the first heat exchanger, and further control the heat exchange intensity of the first heat exchanger.

5. The temperature control system for mine roadway based on day-night cold storage and phase change regulation according to claim 4, characterized in that, Also includes: A second temperature sensor (26) is provided in the chamber (7, 8) and is used to obtain the temperature of the chamber (7, 8); A third temperature sensor (57) is arranged inside the phase change filling body (1, 2, 3, 4) and is used to obtain the temperature of the phase change material (5).

6. The mine roadway temperature control system based on day-night cold storage and phase change regulation according to claim 5, wherein, Also includes: A weather monitor (25) is provided outside the mine and is used to obtain outdoor ambient temperature, ambient humidity and wind speed.

7. A mine room temperature control method based on day and night cold storage and phase change regulation, applied to the temperature control system according to any one of claims 1 to 6, characterized in that: The temperature control method comprises: In response to the outdoor ambient temperature T at night W being lower than the phase change temperature T of the phase change material X , start the first cold storage mode, that is, control the heat exchange medium to circulate among the heat exchanger group, the liquid collector, the heat exchange tube group and the liquid distributor; In response to the temperature T of the chamber during the day G being higher than the first preset threshold, start the cold release mode, that is, control the heat exchange medium to circulate between the heat exchange tube group, the liquid distributor, the surface cooler group and the liquid collector.

8. The temperature control method for mine roadway based on day-night cold storage and phase change regulation according to claim 7, characterized in that, The temperature control method further comprises: The conditions for starting the first cold storage mode also include all of the following: the outdoor ambient temperature T at night W is lower than the phase change temperature T of the phase change material X lasting for more than a second preset threshold, the outdoor ambient air humidity φ W ≤ 65%, and the residual pressure of the mine ventilation system is greater than or equal to 200 Pa; in the first cold storage mode, based on the cold storage rate of the phase change material being greater than or equal to a third preset threshold, control the louvered air valve of the first heat exchanger to be in the open state, otherwise, control the independent fan and the louvered air valve of the first heat exchanger to be in the open state simultaneously.

9. The temperature control method for mine roadway based on day-night cold storage and phase change regulation according to claim 8, characterized in that, The temperature control method further comprises: In response to the working time being the daytime period, the second cold storage mode is activated, that is, the heat exchange medium is controlled to circulate among the heat exchange tube group, the liquid distributor, the return pipe, and the liquid collector; and when at least one of the following conditions is met, the cooling tower is controlled to enter the operation state: (a) The consumption rate of the cold storage capacity of the phase change filling body is greater than or equal to the fourth preset threshold of the cold storage capacity replenishment rate; (b) The local temperature of the mine equipment in the chamber exceeds the fifth preset threshold and lasts for ten minutes or more; (c) The predicted value of the daily average heat load of the chamber exceeds the sixth preset threshold and lasts for two hours or more; (d) The wind speed V of the mine external environment W is less than the seventh preset threshold; The cooling tower has a dry mode and a wet mode. In the dry mode, air is used as the cooling medium to exchange heat with the heat exchange medium in the return pipe. In the wet mode, spray water is used as the cooling medium to exchange heat with the heat exchange medium in the return pipe. In winter or dusty weather, the cooling tower operates in dry mode; otherwise, the cooling tower operates in wet mode.

10. The mine roadway temperature control method based on day-night cold storage and phase change regulation according to claim 7, wherein The temperature control method comprises: In winter, the temperature control system is defaultly controlled to store cold in the first cold storage mode; if the phase change material temperature T X is greater than or equal to the eighth preset threshold or when the mine emergency heat load is triggered, the heat exchange medium is simultaneously controlled to circulate between the heat exchange tube group, the distributor, the return pipe and the collector, and the cooling tower is controlled to operate in the dry mode, wherein in the dry mode, air is used as the cooling medium to exchange heat with the heat exchange medium in the return pipe; in response to the temperature T0≤2°C at the mine entrance roadway, at least part of the heat exchange medium is controlled to circulate between the distributor and the second heat exchanger arranged at the mine entrance roadway; In summer: (e) In response to the working hours being between 23:00 and 6:00 or the outdoor ambient temperature T W ≤ 5°C, control the temperature control system to store cold in the first cold storage mode; (f) In response to the working hours being between 10:00 and 18:00 or the outdoor ambient temperature T W ≥ 25°C, control the temperature control system to store cold in the second cold storage mode, that is, control the heat exchange medium to circulate between the heat exchange tube group, the liquid distributor, the return pipe and the liquid collector, and the cooling tower operates in the wet mode, and in the wet mode, spray water is used as the cooling medium to exchange heat with the heat exchange medium in the return pipe; (g) In response to the working hours being between 06:00 and 10:00 and 18:00 and 23:00 or the outdoor ambient temperature T W being between 5°C and 25°C, control the temperature control system to store cold in both the first cold storage mode and the second cold storage mode.

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