Large-temperature-difference cold conveying mine cooling system

Abstract

The utility model relates to the technical field of mine cooling, in particular to a large-temperature-difference cold conveying mine cooling system. According to the technical scheme, the cooling system comprises a cooling tower and further comprises a cooling water pump connected to the cooling tower. According to the large-temperature-difference cold conveying mine cooling system, the first cooling assembly, the second cooling assembly, the third cooling assembly and other structures are matched, and the large-temperature-difference cold conveying mine cooling system combines the advantages and characteristics of a ground centralized mine cooling system, an underground centralized mine cooling system and a local mine cooling system; by means of the mode that the three refrigerating units on the ground are connected in series for operation, large-temperature-difference supply and return water temperature supply is achieved, and the refrigerating effect in the deep mine high-temperature heat damage treatment process is remarkably improved through the design. And meanwhile, the system adopts stepped cooling, and corresponding refrigeration equipment is arranged in underground chambers of mining areas in a targeted manner, so that the cold water conveying distance is effectively shortened, the cold loss is reduced, the lower energy consumption and the better cooling effect are realized, and the energy utilization is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of mine cooling, in particular to a mine cooling system with large temperature difference cold transportation. Background Technique

[0002] China is the world's largest coal-producing country. However, with the continuous increase of mining depth, the problem of underground heat damage has become increasingly prominent, becoming one of the major challenges in deep mining engineering. Therefore, the research on high-temperature mine cooling technology has become an urgent problem to be solved in the world's mining industry today.

[0003] Mine cooling technologies are mainly divided into two categories: non-artificial refrigeration technology and artificial refrigeration technology. Non-artificial refrigeration technology is mainly applicable to occasions with relatively shallow mining depth and insignificant heat damage problems. At present, artificial refrigeration technology is adopted for mine cooling at home and abroad. Artificial refrigeration and cooling technology can be divided into compressed air cooling technology, artificial refrigerated water cooling technology, and artificial ice-making cooling technology according to different cold-carrying media.

[0004] For the current status of high-temperature heat damage, the most effective way is still to adopt an artificial refrigerated water air-conditioning system. According to the installation location of the refrigeration station, it can be further divided into a ground centralized air-conditioning system, an underground centralized air-conditioning system, a ground-underground combined centralized air-conditioning system, and an underground decentralized local air-conditioning system. Among them, the ground centralized air-conditioning system is the most commonly used technology for current mine cooling.

[0005] The working principle of the ground centralized air-conditioning system is that through the refrigeration station installed on the ground, the refrigerant is sent to the equipment set underground through the heat-insulating pipeline, and the cold air is cooled by the air cooler to release cold, and the condensation heat is discharged by the ground cooling tower. Although the ground centralized air-conditioning system has wide applications and remarkable effects in the field of mine cooling, there are still some disadvantages that cannot be ignored in its actual use. First of all, the pressure conversion of cooling water is an important problem. Secondly, due to the long length of the cold supply pipeline, the large diameter of the large cold-capacity refrigerated water pipeline, the tight space in the vertical shaft, the high construction cost, high pump energy consumption, and large loss of refrigeration capacity, which not only reduces the efficiency of the system but also increases the energy consumption. Content of the Utility Model

[0006] The purpose of the utility model is to address the problems existing in the ground centralized air-conditioning system in the field of mine cooling that cannot be ignored. First of all, the pressure conversion of cooling water is an important problem. Secondly, due to the long length of the cold supply pipeline, the large diameter of the large cold-capacity refrigerated water pipeline, the tight space in the vertical shaft, the high construction cost, high pump energy consumption, and large loss of refrigeration capacity, which not only reduces the efficiency of the system but also increases the energy consumption, and proposes a mine cooling system with large temperature difference cold transportation.

[0007] Technical solution of the utility model: A large temperature difference cold transportation mine cooling system includes a cooling tower, and further includes: a cooling water pump connected to the cooling tower, the cooling water pump is sequentially connected to a three-stage refrigeration unit, a two-stage refrigeration unit and a one-stage refrigeration unit, the one-stage refrigeration unit is connected to the cooling tower, the one-stage refrigeration unit and the three-stage refrigeration unit are connected to a one-stage chilled water pump, and the one-stage chilled water pump is sequentially connected to a PERS potential energy recovery heat exchanger unit, a circulation pump, a constant pressure tank, a softening water tank and a make-up water pump; wherein the circulation pump is connected to a first cooling component, a second cooling component and a third cooling component.

[0008] Optionally, the first cooling component includes a plurality of water-cooled air coolers sequentially connected to the circulation pump in order.

[0009] Optionally, the second cooling component includes a water-cooled air cooler connected to the circulation pump, a second direct expansion refrigeration main unit and a second evaporative air cooler.

[0010] Optionally, the third cooling component includes a modular refrigeration main unit and a water-cooled air cooler connected to the circulation pump.

[0011] Optionally, the water-cooled air cooler of the first cooling component far from the circulation pump is connected to a deep cooling local component, and the deep cooling local component includes a water-cooled air cooler, a booster pump, a first direct expansion refrigeration main unit and a first evaporative air cooler connected in sequence.

[0012] Optionally, the water-cooled air cooler of the first cooling component close to the circulation pump and the circulation pump are connected to a first deep cooling centralized component, and the first deep cooling centralized component includes a plurality of first modular refrigeration main units and a first secondary chilled water pump connected to the first modular refrigeration main unit.

[0013] Optionally, the water-cooled air cooler of the third cooling component close to the circulation pump and the circulation pump are connected to a second deep cooling centralized component, and the second deep cooling centralized component includes a plurality of second modular refrigeration main units and a second secondary chilled water pump connected to the second modular refrigeration main unit.

[0014] In summary, the present application includes at least one of the following beneficial technical effects of the large temperature difference cold transportation mine cooling system:

[0015] The utility model combines the advantages of a ground centralized mine cooling system, an underground centralized mine cooling system and a local mine cooling system by using the cooperation of structures such as the first cooling component, the second cooling component and the third cooling component in the large temperature difference cold transportation mine cooling system;

[0016] Furthermore, by means of the series operation of three groups of ground refrigeration units, the supply of large temperature difference between the supply and return water temperatures is realized. This design significantly improves the refrigeration effect during the treatment of high-temperature heat damage in deep mines. At the same time, the system uses cascaded cooling, and corresponding refrigeration equipment is arranged in a targeted manner in the underground chambers of each mining area, effectively shortening the cold water transportation distance, reducing the cold loss, thus achieving lower energy consumption and better cooling effect, and optimizing the energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The first flowchart of a large temperature difference cold transportation mine cooling system of the present utility model is given;

[0018] Figure 2 The second flowchart of a large temperature difference cold transportation mine cooling system of the present utility model is given;

[0019] Figure 3 The third flowchart of a large temperature difference cold transportation mine cooling system of the present utility model is given;

[0020] Figure 4 It is a pressure conversion change diagram of the cooling system.

[0021] Reference numerals: 1, cooling tower; 2, cooling water pump; 3, primary refrigeration unit; 4, secondary refrigeration unit; 5, tertiary refrigeration unit; 6, primary chilled water pump; 7, PERS potential energy recovery heat exchange unit; 8, circulation pump; 9, constant pressure tank; 10, softening water tank; 11, makeup water pump; 12, water-cooled air cooler; 13, booster pump; 14, first direct expansion refrigeration host; 15, first evaporative air cooler; 16, first module refrigeration host; 17, first secondary chilled water pump; 18, second module refrigeration host; 19, second secondary chilled water pump; 20, second direct expansion refrigeration host; 21, second evaporative air cooler. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments.

[0023] The components of the embodiments of the present utility model usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model.

[0024] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0026] It should be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" 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 or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] Embodiment 1

[0029] As Figures 1-4 shown, a large temperature difference cold transportation mine cooling system proposed by the present utility model includes a cooling tower 1, and further includes: a cooling water pump 2 connected to the cooling tower 1, the cooling water pump 2 is sequentially connected to a three-stage refrigeration unit 5, a two-stage refrigeration unit 4 and a one-stage refrigeration unit 3, the one-stage refrigeration unit 3 is connected to the cooling tower 1, the one-stage refrigeration unit 3 and the three-stage refrigeration unit 5 are connected to a one-stage chilled water pump 6, and the one-stage chilled water pump 6 is sequentially connected to a PERS potential energy recovery heat exchanger unit 7, a circulation pump 8, a pressure stabilizing tank 9, a softening water tank 10 and a makeup water pump 11; wherein the circulation pump 8 is connected to a first cold component for cooling, a second cold component for cooling and a third cold component for cooling, and the first cold component for cooling includes a plurality of water-cooled air coolers 12 sequentially connected to the circulation pump 8.

[0030] Among them, the water-cooled air cooler 12 of the first cooling cold component far from the circulation pump 8 is connected with a deep cooling local component, and the deep cooling local component includes a water-cooled air cooler 12, a booster pump 13, a first direct expansion refrigeration host 14, and a first evaporative air cooler 15 connected in sequence.

[0031] Furthermore, the water-cooled air cooler 12 of the first cooling cold component close to the circulation pump 8 and the circulation pump 8 are connected with a first deep cooling centralized component, and the first deep cooling centralized component includes a plurality of first modular refrigeration hosts 16 and a first secondary chilled water pump 17 connected to the first modular refrigeration host 16.

[0032] Furthermore, the ground refrigeration station uses three chillers in series for three-stage refrigeration to achieve large temperature difference cold transportation and cooling through the three-stage refrigeration unit 5; the PERS potential energy recovery heat exchange unit 7 is used to process the high-pressure cooling water transported by the ground refrigeration station to the underground equipment; for downhole cooling, different schemes are selected for multi-stage gradient cooling according to the cooling requirements of different mining areas; explosion-proof electromechanical equipment should be used for downhole refrigeration equipment.

[0033] Furthermore, the cold transportation energy consumption of the large temperature difference cold transportation and cooling system is relatively low, bringing better cold transportation effect, and the ground refrigeration station can meet the requirements by using conventional chillers; the supply and return water temperature difference is large, and the diameter of the wellbore pipeline is small; the equipment in the ground cooling machine room is small, and the floor area is small; the downhole refrigerator uses low-pressure cooling water, and the configured condenser is an atmospheric pressure device, with higher safety and reliability; the refrigerator is close to the working face, effectively reducing the laying of downhole refrigeration pipelines, reducing the cold loss of cold water in the pipelines, with low energy consumption and better cooling effect; the downhole multi-stage gradient cooling is applicable to various refrigeration requirements, improving the energy utilization efficiency.

[0034] In this embodiment, the ground refrigeration station cools the 32°C chilled water completed by downhole heat exchange through three-stage series refrigeration. First, the first-stage refrigeration unit 3 cools the 32°C chilled water to 22°C, then the second-stage refrigeration unit 4 further cools it to 13°C chilled water, and finally enters the third-stage refrigeration unit 5 for heat exchange to 4°C low-temperature chilled water, which is transported to the underground through the wellbore insulation pipeline. Then, the PERS potential energy recovery heat exchange unit 7 converts the 4°C high-static pressure chilled water caused by depth problems into 4.5°C low-pressure chilled water and sends it to the downhole cooling equipment for cascade cooling.

[0035] Such as Figure 1As shown in the figure, this mode is applicable to extreme cooling requirements underground. First, 4.5°C low-pressure chilled water is sent to the water-cooled air coolers 12 at each working face for primary cooling. For individual working faces with higher cooling requirements, the 15°C outlet water generated after primary cooling is used as the cooling water for the first direct expansion refrigeration host 14. After heat exchange with the refrigerant, 32°C cooling return water is generated. The refrigerant of the first direct expansion refrigeration host 14 is cooled and then passes through the first evaporative air cooler 15 to perform secondary local deep cooling of the mine. The 32°C return water after secondary cooling is mixed with the 15°C return water after primary cooling to form mixed chilled water at 15 - 25°C. This part of the mixed chilled water is introduced into the centralized first module refrigeration host 16 as cooling water and undergoes secondary centralized deep cooling through the corresponding water-cooled air coolers 12. The 33°C cooling return water obtained after heat exchange with the refrigerant of the first direct expansion refrigeration host 14 is sent back to the PERS potential energy recovery heat exchange unit 7 by the circulation pump 8 and is converted into 32°C high-pressure cooling water through pressure conversion. These high-pressure cooling waters overcome the conveying pressure of the shaft pipeline and are conveyed back to the ground refrigeration station in the form of low-pressure cooling water to form a cycle. Through the cascade cooling method of the first cooling component, the deep cooling local component, and the first-stage deep cooling centralized component, a mine cooling and cold transportation system with a maximum temperature difference of up to 28°C is constructed, which can meet the cooling needs of high-temperature heat-hazard mines to the greatest extent and can also flexibly use cold according to the needs of underground chambers.

[0036] Embodiment 2

[0037] As Figures 1-2 shown, the difference between this embodiment and Embodiment 1 is that the second cooling component includes two groups of water-cooled air coolers 12 connected to the circulation pump 8, the second direct expansion refrigeration host 20, and the second evaporative air cooler 21.

[0038] In this embodiment, as Figure 2 shown, this mode directly adopts the form of the second deep cooling local component, and sends the 4.5°C low-pressure chilled water obtained by potential energy conversion into the water-cooled air cooler 12 for heat exchange. The 15°C outlet water after heat exchange is used as the cooling water for the condenser of the second direct expansion refrigeration host 20. The refrigerant in the second direct expansion refrigeration host 20 is cooled by the cooling water and then enters the second evaporative air cooler 21 to exchange heat with the high-temperature air in the mine. After the refrigerant absorbs the heat of the air, it is compressed and continues to be cooled in the condenser, and this cycle continues for deep refrigeration. The cooling return water at 32°C is generated after the cooling water exchanges heat with the refrigerant. Finally, the return water of these second deep cooling local components is collected and sent to the PERS potential energy recovery heat exchange unit through the circulation pump 8 for pressure conversion, and then sent back to the ground. This mode can still achieve large-temperature-difference cold transportation and cooling through the second deep cooling local component.

[0039] Embodiment 3

[0040] AsFigure 1 and Figure 3 As shown in Figure 3 , the difference between this embodiment and the first embodiment lies in that: the first cooling cold component includes a plurality of water-cooled air coolers 12 connected to the circulation pump 8 in sequence; the water-cooled air cooler 12 of the third cooling cold component close to the circulation pump 8 and the circulation pump 8 are connected with a second deep cooling centralized component, and the second deep cooling centralized component includes a plurality of second module refrigeration hosts 18 and a second secondary refrigeration water pump 19 connected to the second module refrigeration host 18.

[0041] In this embodiment, as Figure 3 shown in Figure 3 , this mode adopts a mine cooling mode combining the first cooling cold component and the second deep cooling centralized component. The 15°C return water cooled by the first-stage water-cooled air cooler is sent as cooling water to the second module refrigeration host 18 for heat exchange. Centralized deep cooling is achieved through the circulating heat exchange between the host and the water-cooled air cooler 12. The 33°C cooling return water after heat exchange with the refrigerant is then sent back to the ground through the circulation pump 8 and into the PERS potential energy recovery heat exchange unit 7. This mode uses the first cooling cold component in series with the second deep cooling centralized component to achieve efficient cold transfer under large temperature difference conditions.

[0042] The preferred embodiments of the above utility model are only used to help illustrate the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only the specific implementation manners. Obviously, according to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the utility model, so that those skilled in the relevant technical field can well understand and utilize the utility model. The utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A large temperature difference cooling system for a mine, comprising a cooling tower (1), characterized in that: Also includes: A cooling water pump (2) connected to the cooling tower (1), the cooling water pump (2) being sequentially connected to a three-stage refrigeration unit (5), a two-stage refrigeration unit (4) and a first-stage refrigeration unit (3), the first-stage refrigeration unit (3) being connected to the cooling tower (1), the first-stage refrigeration unit (3) and the three-stage refrigeration unit (5) being connected to a first-stage chilled water pump (6), the first-stage chilled water pump (6) being sequentially connected to a PERS potential energy recovery heat exchange unit (7), a circulation pump (8), a constant pressure tank (9), a softened water tank (10) and a water supply pump (11); The circulation pump (8) is connected to a first cooling component, a second cooling component and a third cooling component.

2. A large temperature difference cooling system for mines according to claim 1, characterized in that: The first cooling component comprises a plurality of water-cooled air coolers (12) connected to the circulation pump (8) in sequence.

3. A large temperature difference cooling system for mines according to claim 1, characterized in that: The second cooling component comprises a water-cooled air cooler (12) connected to a circulation pump (8), a second direct expansion refrigeration main unit (20) and a second evaporative air cooler (21).

4. A large temperature difference cooling system for mines according to claim 1, characterized in that: The third cooling component comprises a module refrigeration main unit (16) connected to a circulation pump (8) and a water-cooled air cooler (12).

5. A large temperature difference cooling system for mines according to claim 1, characterized in that: The first cooling component is connected to a water-cooled air cooler (12) away from the circulation pump (8) and is provided with a deep cooling local component, wherein the deep cooling local component comprises a water-cooled air cooler (12), a booster pump (13), a first direct expansion refrigeration main unit (14) and a first evaporative air cooler (15) connected in sequence.

6. A large temperature difference cooling system for mines according to claim 1, characterized in that: The first cooling cold component is connected to a water-cooled air cooler (12) close to the circulating pump (8) and the circulating pump (8) with a first deep cold centralized component, the first deep cold centralized component comprising a plurality of first module refrigeration hosts (16) and first and second level chilled water pumps (17) connected to the first module refrigeration hosts (16).

7. A large temperature difference cooling system for mines according to claim 1, characterized in that: The third cooling cold component is close to the water-cooled air cooler (12) of the circulating pump (8) and the circulating pump (8) is connected to a second deep cold concentrated component, and the second deep cold concentrated component includes a plurality of second module refrigeration hosts (18) and a second secondary chilled water pump (19) connected to the second module refrigeration hosts (18).

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