Mine underground refrigeration and waste heat comprehensive utilization system

Abstract

The utility model relates to a mine underground refrigeration and waste heat comprehensive utilization system, which comprises a first-stage refrigeration cycle, a second-stage refrigeration cycle and an underground cold air cycle, the first-stage refrigeration cycle comprises a first-stage refrigeration unit, a first circulating pump, a first valve, a first cooling tower, a second valve and a heat consumer which are sequentially connected through a circulating pipeline; the second-stage refrigerating cycle comprises a hydraulic conveying potential energy recovery device, a second circulating pump, a fourth valve and a second-stage refrigerating unit which are sequentially connected through a circulating pipeline, and the high-pressure side of the hydraulic conveying potential energy recovery device communicates with the second-stage refrigerating cycle; and the underground cold air circulation comprises a fourth circulating pump and an air cooler which are connected with a low-pressure side circulating pipeline of the hydraulic conveying potential energy recovery device. According to the utility model, underground refrigeration is carried out by adopting a step cooling mode, the refrigeration effect is improved, meanwhile, heat is supplied to buildings above the well, the utilization of energy is increased, and the waste of energy is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of deep mine heat damage control, in particular to an underground mine refrigeration and waste heat comprehensive utilization system. Background Art

[0002] Coal mining depths in my country are increasing at a rate of 8-12 meters per year, with eastern mines experiencing even greater increases of 100-250 meters every decade. Heat damage is becoming increasingly serious in underground working environments, such as mine tunnels. High temperatures and high humidity underground pose significant risks to both the human body and equipment, significantly reducing production efficiency and increasing accident rates, posing a significant threat to the health of workers and safe mine production.

[0003] Heat damage in mines is caused by geothermal heat, heat dissipation from electromechanical equipment, heat release from minerals and gangue, and heat release from air compression. Heat damage can lead to impaired body temperature regulation, fatigue, and increased potential for accidents. High temperatures also adversely affect mechanical and electrical equipment, potentially causing safety incidents. Heat damage is particularly severe in deep mines. Currently, refrigeration equipment is a crucial technical support tool for combating heat damage in mining. To reduce transportation distances and mitigate the pressure on equipment caused by significant gravitational potential energy, it is advantageous to locate refrigeration equipment underground. However, the space occupied by refrigeration equipment makes it difficult to maintain the already limited underground space. The need to operate and maintain equipment requires going down into the mine, creating management challenges and hindering its application. Utility Model Content

[0004] The purpose of this utility model is to propose a mine underground refrigeration and waste heat comprehensive utilization system, which adopts a stepped cooling method for underground refrigeration, improves the refrigeration effect, and at the same time provides heat to the buildings above the well, increases energy utilization and reduces energy waste.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a mine underground refrigeration and waste heat comprehensive utilization system, including a primary refrigeration cycle arranged on the ground, a secondary refrigeration cycle and an underground cold air cycle arranged in the mine tunnel, the primary refrigeration cycle includes a primary refrigeration unit, a first circulation pump, a first valve, a first cooling tower, a second valve and a heat user connected in sequence by circulation pipelines, the primary refrigeration unit includes a primary compressor, a primary condenser, a primary throttle valve and a primary evaporator connected in sequence by circulation pipelines, the secondary refrigeration cycle includes a hydraulic transmission potential energy recovery device, a second circulation pump, a fourth valve, a secondary refrigeration unit connected in sequence by circulation pipelines, the secondary refrigeration unit The group includes a secondary compressor, a secondary condenser, a secondary throttle valve and a secondary evaporator connected in sequence by circulation pipes. The water inlet and outlet of the secondary condenser are respectively connected to the water outlet and inlet of the primary evaporator. A third circulation pump is provided between the secondary condenser and the primary evaporator. A third valve and a second cooling tower are provided in parallel on the pipe between the second circulation pump and the fourth valve. The hydraulic conveying potential energy recovery device is arranged in the tunnel at the bottom of the mine. The high-pressure side of the hydraulic conveying potential energy recovery device is connected to the secondary refrigeration cycle. The underground cold air circulation includes a fourth circulation pump and an air cooler connected to the low-pressure side circulation pipe of the hydraulic conveying potential energy recovery device.

[0006] Preferably, the first cooling tower is an open cooling tower, and the second cooling tower is a closed cooling tower.

[0007] Preferably, the primary refrigeration unit and the secondary refrigeration unit are modular air-cooled heat pump units.

[0008] Preferably, the mine underground refrigeration and waste heat comprehensive utilization system adopts a PLC programming control operation mode.

[0009] Based on the above technical solution, the advantages of the utility model are:

[0010] The utility model of the underground mine refrigeration and waste heat comprehensive utilization system is divided into a primary refrigeration cycle, a secondary refrigeration cycle and an underground cold air cycle. While meeting the underground refrigeration needs, it performs combined refrigeration of different modules according to the changes in the surface ambient temperature and the heating needs of the building, thereby improving energy utilization and reducing energy waste. It has the following advantages:

[0011] 1. Waste heat can be recovered in winter and used to heat buildings above the well;

[0012] 2. The units are installed on the ground in a centralized manner, occupying a small area;

[0013] 3. The unit can adopt modular design, with short construction period and quick installation;

[0014] 4. Two-stage refrigeration, stable refrigeration;

[0015] 5. Easy heat dissipation and diversified heat dissipation methods;

[0016] 6. Multiple mode switching improves the flexibility and scalability of the system and can flexibly cope with multi-season temperature changes;

[0017] 7. It can provide both cold and hot water in winter, with high economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the mine's underground refrigeration and waste heat comprehensive utilization system. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0021] The utility model provides a mine underground refrigeration and waste heat comprehensive utilization system, such as Figure 1 As shown, a preferred embodiment of the present utility model is shown.

[0022] like Figure 1As shown, the mine underground refrigeration and waste heat comprehensive utilization system includes a primary refrigeration cycle arranged on the ground, a secondary refrigeration cycle and an underground cold air cycle arranged in the mine tunnel, the primary refrigeration cycle includes a primary refrigeration unit 1, a first circulation pump 2, a first valve 3, a first cooling tower 4, a second valve 5 and a heat user connected in sequence by circulation pipelines, the primary refrigeration unit 1 includes a primary compressor 1-3, a primary condenser 1-2, a primary throttle valve 1-4 and a primary evaporator 1-1 connected in sequence by circulation pipelines, the secondary refrigeration cycle includes a hydraulic transmission potential energy recovery device 6, a second circulation pump 7, a fourth valve 10 and a secondary refrigeration unit 11 connected in sequence by circulation pipelines, the secondary refrigeration unit 11 includes a secondary compressor connected in sequence by circulation pipelines 11-3, secondary condenser 11-2, secondary throttle valve 11-4 secondary evaporator 11-1, the water inlet and outlet of the secondary condenser 11-2 are respectively connected to the water outlet and inlet of the primary evaporator 1-1, a third circulation pump 12 is provided between the secondary condenser 11-2 and the primary evaporator 1-1, a third valve 8 and a second cooling tower 9 are provided in parallel on the pipeline between the second circulation pump 7 and the fourth valve 10, the hydraulic conveying potential energy recovery device 6 is arranged in the tunnel at the bottom of the mine, the high-pressure side of the hydraulic conveying potential energy recovery device 6 is connected to the secondary refrigeration cycle, and the underground cold air circulation includes a fourth circulation pump 13 and an air cooler 14 connected to the low-pressure side circulation pipeline of the hydraulic conveying potential energy recovery device 6.

[0023] The utility model provides a mine underground refrigeration and waste heat comprehensive utilization system which is divided into a primary refrigeration cycle, a secondary refrigeration cycle and an underground cold air cycle. While meeting the underground refrigeration needs, it performs combined refrigeration of different modules according to the changes in the ambient temperature above the well and the heating needs of the building, thereby improving energy utilization and reducing energy waste.

[0024] Preferably, the first cooling tower 4 is an open cooling tower, which has lower cost and efficiency. Since the water quality requirements of the hydraulic transmission potential energy recovery device 6 need to be fully met, the second cooling tower 9 is a closed cooling tower.

[0025] Preferably, the primary refrigeration unit 1 and the secondary refrigeration unit 11 are modular air-cooled heat pump units. The modular air-cooled heat pump units serve as backup for each other, which has higher reliability.

[0026] Preferably, the mine underground refrigeration and waste heat comprehensive utilization system adopts a PLC programming control operation mode.

[0027] Since the chilled water prepared by the primary refrigeration unit 1 and the secondary refrigeration unit 11 needs to be transported to the working surface at the bottom of the mine tunnel, which is often very deep, even more than 1,000 meters below the ground, the water pressure at the bottom will reach more than 100 kilograms. If heat exchange is carried out directly, the heat exchange equipment at the bottom will need to withstand huge pressure, which will pose a great challenge to both use and manufacturing.

[0028] The technical solution of the present invention uses a hydraulic transmission potential energy recovery device 6 to isolate the pressure of the secondary refrigeration cycle and the underground cold air cycle, so that the operating pressure of the equipment of the underground cold air cycle is low and the manufacturing and maintenance are relatively convenient. The hydraulic transmission potential energy recovery device 6 can be a valve-controlled recovery device or a plunger-type potential recovery device, which can recover most of the gravitational potential energy of the high-pressure side chilled water, and the high-pressure chilled water is converted into low-pressure side chilled water to enter the underground cold air cycle, and the recovered energy is used to circulate and transport the return water upward.

[0029] Furthermore, the working principle of the mine underground refrigeration and waste heat comprehensive utilization system of the present utility model is as follows:

[0030] In the primary refrigeration cycle, cold water enters from the water inlet of the primary condenser 1-2 of the primary refrigeration unit 1, and after being heated through heat exchange, the cold water flows out from the water outlet of the primary condenser 1-2, passes through the first circulation pump 2, and enters the building for heat exchange through the second valve 5. It can also pass through the first valve 3 to enter the first cooling tower 4 for cooling, and finally returns to the water inlet of the primary condenser 1-2 to complete a refrigeration and heating cycle.

[0031] If the building does not need heating, the second valve 5 is closed, and cold water enters from the water inlet of the first-stage condenser 1-2 of the first-stage refrigeration unit 1. After the cold water is heated through heat exchange, it flows out from the water outlet of the first-stage condenser 1-2, passes through the first circulation pump 2 and the first valve 3, enters the first cooling tower 4 for cooling, and returns to the water inlet of the first-stage condenser 1-2, completing a refrigeration cycle.

[0032] The hot water passes through the third circulation pump 12 and enters the water inlet of the first-stage evaporator 1-1 to exchange heat with the cold water in the first-stage condenser 1-2 to cool down. Then, the hot water enters the water inlet of the second-stage condenser 11-2 from the water outlet of the first-stage evaporator 1-1, heat-exchanges with the cold water to heat it up, and then flows out from the water outlet of the second-stage condenser 11-2 through the third circulation pump 12 and returns to the water inlet of the first-stage evaporator 1-1, completing a cycle.

[0033] In the secondary refrigeration system, the hot water passes through the hydraulic conveying potential energy recovery device 6 and the second circulation pump 7 and can be divided into two paths. One path passes through the fourth valve 10 and the secondary evaporator water inlet 11-1, and after heat exchange and cooling, it flows out from the secondary evaporator 11-1 outlet and returns to the hydraulic conveying potential energy recovery device 6. The other path passes the hot water through the third valve 8, is sent to the second cooling tower 9 for cooling, and then returns to the hydraulic conveying potential energy recovery device 6 to complete a cycle.

[0034] In ultra-low temperature environments, fourth valve 10 is closed, and hot water flows through hydraulic transmission potential energy recovery device 6, second circulation pump 7, and third valve 8 before entering second cooling tower 9 for cooling and returning to hydraulic transmission potential energy recovery device 6, completing a cycle. Heat displaced by the cooling system is released directly by second cooling tower 9, without passing through secondary chiller 11.

[0035] In the underground cooling air system, cold water starts from the low-pressure side 6 of the hydraulic conveying potential energy recovery device, enters the air cooler 14, and exchanges heat with the hot air inside the mine. The hot air becomes cold air and cools down each working surface of the mine. The cold water in the air cooler 14 becomes hot water, and the hot water enters the low-pressure side of the hydraulic conveying potential energy recovery device 6 through the fourth circulation pump 13, and is converted into high-pressure output, completing a cycle of the cooling air system.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A mine underground refrigeration and waste heat comprehensive utilization system, characterized by: The invention comprises a primary refrigeration cycle arranged on the ground, a secondary refrigeration cycle and an underground cold air cycle arranged in a mine tunnel, wherein the primary refrigeration cycle comprises a primary refrigeration unit (1), a first circulation pump (2), a first valve (3), a first cooling tower (4), a second valve (5) and a heat user connected in sequence by a circulation pipeline, the primary refrigeration unit (1) comprises a primary compressor (1-3), a primary condenser (1-2), a primary throttle valve (1-4) and a primary evaporator (1-1) connected in sequence by a circulation pipeline, the secondary refrigeration cycle comprises a hydraulic transmission potential energy recovery device (6), a second circulation pump (7), a fourth valve (10) and a secondary refrigeration unit (11) connected in sequence by a circulation pipeline, the secondary refrigeration unit (11) comprises a secondary compressor (11-3), a secondary condenser (1-2) and a secondary evaporator (1-1) connected in sequence by a circulation pipeline (11-2), a secondary throttle valve (11-4) and a secondary evaporator (11-1); the water inlet and the water outlet of the secondary condenser (11-2) are respectively connected to the water outlet and the water inlet of the primary evaporator (1-1); a third circulation pump (12) is provided between the secondary condenser (11-2) and the primary evaporator (1-1); a third valve (8) and a second cooling tower (9) are provided in parallel on the pipeline between the second circulation pump (7) and the fourth valve (10); the hydraulic conveying potential energy recovery device (6) is provided in a tunnel at the bottom of the mine; the high-pressure side of the hydraulic conveying potential energy recovery device (6) is connected to the secondary refrigeration cycle; the underground cold air circulation includes a fourth circulation pump (13) and an air cooler (14) connected to the low-pressure side circulation pipeline of the hydraulic conveying potential energy recovery device (6).

2. The mine underground refrigeration and waste heat comprehensive utilization system according to claim 1 is characterized in that: The first cooling tower (4) is an open cooling tower, and the second cooling tower (9) is a closed cooling tower.

3. The underground mine refrigeration and waste heat comprehensive utilization system according to claim 2 is characterized in that: The first-stage refrigeration unit (1) and the second-stage refrigeration unit (11) are modular air-cooled heat pump units.

4. The mine underground refrigeration and waste heat comprehensive utilization system according to claim 2 is characterized in that: The mine underground refrigeration and waste heat comprehensive utilization system adopts a PLC programming control operation mode.

Images