Mine underground refrigeration and waste heat comprehensive utilization system

Abstract

The invention 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 refrigeration cycle comprises a hydraulic conveying potential energy recovery device, a second circulating pump, a fourth valve and a second-stage refrigeration unit which are sequentially connected through a circulating pipeline, the hydraulic conveying potential energy recovery device is arranged in a roadway at the bottom of the mine, and the high-pressure side of the hydraulic conveying potential energy recovery device communicates with the second-stage refrigeration 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 invention, underground refrigeration is carried out by adopting a step cooling mode, the refrigeration effect is improved, meanwhile, heat is supplied to the building above the well, the utilization of energy is increased, and the waste of energy is reduced.

Description

Technical Field

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

[0002] The depth of coal mining in my country is increasing at a rate of 8 to 12 meters per year, and the eastern mines are even developing at a rate of 100 to 250 meters every 10 years. In underground working environments such as mine tunnels, the problem of heat damage is becoming increasingly serious. The high temperature and high humidity environment underground causes great harm to the human body and equipment, greatly reduces production efficiency, and significantly increases the accident rate, posing a major threat to the personal health of operators and the safe production of mines.

[0003] The causes of heat damage in mines include geothermal heat, heat dissipation of electromechanical equipment, heat release of minerals and gangue, and heat release of wind self-compression. Heat damage can cause body temperature regulation disorders, fatigue, and increased potential accidents. At the same time, high temperature environments have adverse effects on mechanical and electrical equipment, as well as possible safety accidents. Heat damage in deep mines is even more serious. At present, refrigeration equipment has become an important technical support equipment in dealing with mining heat damage. In order to reduce the transportation distance and reduce the pressure on equipment caused by the significant gravitational potential energy, it is beneficial to set up refrigeration equipment underground. However, it occupies underground space, making it difficult to guarantee the already insufficient underground space. The use and maintenance of equipment requires going down the mine, which is difficult to manage, restricting the technical application of this method. Summary of the invention

[0004] The purpose of the present invention 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 buildings above the mine, increases energy utilization, and reduces energy waste.

[0005] To achieve the above-mentioned purpose, the present invention 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, and a secondary refrigeration unit connected in sequence by circulation pipelines, the secondary refrigeration unit It includes a secondary compressor, a secondary condenser, a secondary throttling valve and a secondary evaporator which are connected in sequence by a circulation pipeline. The water inlet and the water outlet of the secondary condenser are respectively connected to the water outlet and the water 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 pipeline between the second circulation pump and the fourth valve. The hydraulic conveying potential energy recovery device is arranged in a 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 pipeline 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 underground mine 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 present invention are:

[0010] The mine underground refrigeration and waste heat comprehensive utilization system of the present invention is divided into a primary refrigeration cycle, a secondary refrigeration cycle and an underground cold air cycle. While meeting the underground refrigeration, it performs combined refrigeration of different modules according to the change of the above-ground ambient temperature and the demand for heating of buildings, thereby improving the utilization of energy and reducing the waste of energy. 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 flexibly responds to multi-season temperature conditions;

[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 underground mine 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 present invention provides a mine underground refrigeration and waste heat comprehensive utilization system, such as Figure 1 As shown, a preferred embodiment of the present invention 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 circulating 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 circulating 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 circulating 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 mine underground refrigeration and waste heat comprehensive utilization system of the present invention is divided into a primary refrigeration cycle, a secondary refrigeration cycle and an underground cold air cycle. While meeting the underground refrigeration needs, combined refrigeration of different modules is performed according to the changes in the above-ground ambient temperature 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 are used as backup for each other, which has stronger reliability.

[0026] Preferably, the underground mine 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, and the working surface is even more than 1,000 meters below the ground, the water pressure at the bottom will reach more than 100 kilograms. If heat is exchanged 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 conveying potential energy recovery device 6 to isolate the pressure of the secondary refrigeration cycle and the underground cold air cycle, so that the equipment operating pressure of the underground cold air cycle is low, and the manufacturing and maintenance are relatively convenient. The hydraulic conveying 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 gravity 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 invention 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 by 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 enter the first cooling tower 4 through the first valve 3 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 primary condenser 1-2 of the primary refrigeration unit 1. After the cold water is heated by heat exchange, it flows out from the water outlet of the primary 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 primary condenser 1-2, completing a refrigeration cycle.

[0032] The hot water enters the water inlet of the first-stage evaporator 1-1 through the third circulation pump 12, exchanges heat with the cold water in the first-stage condenser 1-2 to cool down, and then 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 circulation work.

[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 an ultra-low temperature environment, the fourth valve 10 is closed, and the hot water passes through the hydraulic transmission potential energy recovery device 6, the second circulation pump 7, and the third valve 8, enters the second cooling tower 9 for cooling, and returns to the hydraulic transmission potential energy recovery device 6 to complete a cycle. The heat displaced by the cold air system does not need to pass through the secondary chiller 11, but can be directly released by the second cooling tower 9.

[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 is converted into cold air and the temperature of each working surface of the mine is cooled. The cold water in the air cooler 14 is converted into hot water. 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 present invention rather than to limit it. Although the present invention 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 present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A mine underground refrigeration and waste heat comprehensive utilization system, characterized in that: 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 arranged 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 underground mine 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 primary refrigeration unit (1) and the secondary refrigeration unit (11) are modular air-cooled heat pump units.

4. The underground mine 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.

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