Mine water waste heat coupling cold storage mine air inlet cooling system

Abstract

The utility model discloses a mine water waste heat coupling cold storage mine air inlet cooling system which comprises a pretreatment section connected with mine drainage and a mine drainage water source heat pump, the pretreatment section is sequentially communicated with a desalination section and a clean water tank through pipelines, and the desalination section comprises a desalination section pretreatment facility, an ultrafiltration device and a reverse osmosis device. The clean water tank is communicated with a mine inlet air heat exchanger for cooling mine inlet air through a pipeline; the load side of the mine drainage water source heat pump is connected with a mine water heater through a pipeline, the mine water heater is located between the ultrafiltration device and the reverse osmosis device, and the source side of the mine drainage water source heat pump is communicated with a mine water waste heat recovery heat exchanger through a pipeline, according to the utility model, the water inlet temperature before reverse osmosis is increased through mine water waste heat recovery heating, the mine water desalination efficiency is improved, the mine air inlet temperature is reduced at the same time, the waste heat utilization efficiency is improved, and a comfortable working environment is provided for workers.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mines, and in particular relates to a mine air intake cooling system with mine water waste heat coupled cold storage. Background Art

[0002] In the process of coal mining, mine water, gas, mine return air, etc. are inevitably produced. In recent years, the comprehensive utilization of associated resources in the coal mining process has received more and more attention. Affected by hydrogeological conditions and regional precipitation, a large amount of water will naturally be produced underground during coal mining, showing characteristics such as high suspended matter, high salt content, and heavy metals. The water temperature is mostly around 15-20°C. If the mine water is discharged directly without treatment, it will cause environmental problems such as soil salinization and soil erosion. After pretreatment, desalination and other processes, it can meet the standards for production and living water, which not only solves the problem of water source for coal mine production, but also saves water resources. Reverse osmosis membranes are used in the mine water desalination process. The performance of reverse osmosis membranes is related to the inlet water temperature. The water output will increase accordingly as the inlet water temperature increases. At around 25°C, the operation effect is stable, the operating pressure is low, the operating cost is low, the membrane life is long, and the replacement cycle is long. This requires the installation of a heater before the desalination process to increase the temperature of mine drainage. Currently, steam heat exchangers are mostly used for heating, which requires an external heat source, such as a small coal-fired heating boiler room.

[0003] In addition, during periods of high ambient temperature such as summer, the increase in the mine air temperature, coupled with the heat generated by underground equipment heat dissipation and natural oxidation of coal, causes the temperature in the coal mining face and other areas where workers are located to be high, affecting the health of underground workers and increasing the risk of coal mine accidents. The control of underground heat damage in coal mines has also been an area of ​​gradual attention in recent years. With the increase in mining depth, the temperature underground in coal mines is also getting higher and higher, which also seriously affects the physical and mental health of coal miners. Utility Model Content

[0004] The utility model aims to provide a mine water waste heat coupled cold storage mine air inlet cooling system, which increases the water temperature before reverse osmosis by recovering the waste heat of mine water for heating, improves the mine water desalination efficiency and reduces the mine air inlet temperature, thereby improving the waste heat utilization efficiency and providing a comfortable working environment for workers.

[0005] The technical solution adopted by the utility model is a mine air intake cooling system with waste heat of mine water coupled with cold storage, comprising a pretreatment section connected to mine drainage and a mine drainage water source heat pump, the pretreatment section is sequentially connected to a desalination section and a clear water tank through a pipeline, the desalination section comprises a desalination section pre-treatment facility, an ultrafiltration and a reverse osmosis device sequentially connected through a pipeline, and the clear water tank is connected to a mine air intake heat exchanger for cooling the mine air intake through a pipeline;

[0006] The load side of the mine drainage water source heat pump is connected to a mine water heater through a pipeline. The mine water heater is located between the ultrafiltration and reverse osmosis devices. The source side of the mine drainage water source heat pump is connected to a mine water waste heat recovery heat exchanger through a pipeline. The mine water waste heat recovery heat exchanger cools down the water source flowing from the clear water tank to the mine air inlet heat exchanger.

[0007] The utility model is also characterized in that:

[0008] The pretreatment section includes a regulating pre-sedimentation tank connected to the mine drainage, which is connected in sequence to a pipeline mixer for adding coagulant and a labyrinth water purifier for adding flocculant through pipelines, the bottom of the labyrinth water purifier is connected to a sludge thickening tank through a pipeline, and the bottom of the regulating pre-sedimentation tank is also connected to the sludge thickening tank through a pipeline.

[0009] A lifting pump is arranged between the regulating pre-sedimentation tank and the pipeline mixer.

[0010] The pre-treatment facilities of the desalination section include a high-efficiency clarification tank connected to the pretreatment section. The high-efficiency clarification tank is connected to a V-type filter through a pipeline, and the V-type filter is connected to the ultrafiltration through a pipeline.

[0011] The load side of the mine drainage water source heat pump is also connected to one side of the bathing heat exchanger through a pipeline, and the other side of the bathing heat exchanger is connected to a water source at one end and a bathing hot water tank at the other end.

[0012] A valve a is provided on the pipe connecting the load side outlet of the mine drainage water source heat pump and the water inlet of the mine water heater, and a valve b is provided on the pipe connecting the load side outlet of the mine drainage water source heat pump and the water inlet of the bathing heat exchanger.

[0013] A temperature detector is provided on the pipeline connecting the mine water heater and the reverse osmosis device. The probe of the temperature detector is placed in the pipeline to detect the inlet water temperature of the reverse osmosis device.

[0014] The connecting pipes of the mine water waste heat recovery heat exchanger and the mine air intake heat exchanger are connected to a cold storage tank through a pipe, and the water outlet of the cold storage tank is connected to the connecting pipes of the mine water waste heat recovery heat exchanger and the mine air intake heat exchanger through a pipe.

[0015] An inlet valve is provided on the connecting pipe between the mine water waste heat recovery heat exchanger and the mine air intake heat exchanger and the connecting pipe between the water inlet of the cold storage tank, and an outlet valve is provided on the connecting pipe between the mine water waste heat recovery heat exchanger and the mine air intake heat exchanger and the connecting pipe between the water outlet of the cold storage tank.

[0016] The beneficial effects of the utility model are:

[0017] (1) When the ambient temperature rises during the day, the mine water waste heat coupled cold storage mine air intake cooling system of the utility model closes the inlet valve and opens the outlet valve, so that the low-temperature water in the cold storage tank and the low-temperature water treated by the mine water waste heat recovery heat exchanger are added to the mine air intake heat exchanger, thereby increasing the heat exchange efficiency and further reducing the mine air intake temperature, providing a suitable working environment for underground coal mine production workers.

[0018] During the night when the ambient temperature is low, the outlet valve is closed and the inlet valve is opened. The low-temperature water treated by the mine water waste heat recovery heat exchanger enters the cold storage tank for storage and is used during the day when the ambient temperature rises and the water supply in the clear water pool is small. At the same time, the mine air inlet heat exchanger only circulates the low-temperature water treated by the mine water waste heat recovery heat exchanger to ensure that the mine air inlet temperature is appropriate. By switching and adjusting the inlet valve and the outlet valve, the cold supply responds to the ambient temperature and ensures that the mine air inlet temperature is in the appropriate range at all times.

[0019] (2) The mine water waste heat coupled cold storage mine air inlet cooling system of the utility model connects the load side of the mine drainage water source heat pump with the mine water heater, recovers the heat in the clean water at the end of the mine water treatment process and improves its quality, and then preferentially uses it to heat the reverse osmosis inlet water at the front end of the mine water treatment process, so as to improve the quality of the waste heat at the end and reuse it for front-end heating, thereby increasing the water output of the mine drainage when passing through the reverse osmosis membrane and reducing the energy consumption of the system. When the temperature detector detects that the mine drainage water temperature at the inlet of the reverse osmosis membrane reaches the requirement, the excess heat is transferred to the bathing heat exchanger to heat the water source for the workers' bathing by controlling the opening of valve a and valve b, and the water source after heat exchange is stored in the bathing hot water tank, thereby improving the desalination efficiency of the mine water and making it convenient for the workers to directly use hot water for shower after changing shifts to wash away the coal dust, oil stains, etc. on their bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a mine air inlet cooling system for coupling cold storage with waste heat of mine water according to the utility model;

[0021] Figure 2 It is a structural schematic diagram of the pre-treatment section in the mine air inlet cooling system of the utility model with mine water waste heat coupled cold storage;

[0022] Figure 3 It is a structural schematic diagram of the desalination section in the mine air intake cooling system of the utility model with mine water waste heat coupled cold storage.

[0023] In the figure, 1. pretreatment section, 1-1. regulating pre-sedimentation tank, 1-2. lifting pump, 1-3. pipeline mixer, 1-4. labyrinth water purifier, 1-5. pretreatment water production tank, 1-6. sludge thickening tank;

[0024] 2. Pre-treatment facilities for desalination section, 2-1. High-efficiency clarification tank, 2-2. V-type filtration;

[0025] 3. Ultrafiltration, 4. Mine water heater, 5. Reverse osmosis device, 6. Clear water tank, 7. Mine drainage water source heat pump, 8. Mine water waste heat recovery heat exchanger, 9. Cold storage tank, 10. Mine air inlet heat exchanger, 11. Bathing heat exchanger, 12. Bathing hot water tank, 13. Temperature detector, 14. Inlet valve, 15. Outlet valve, 16. Valve a, 17. Valve b. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Example 1

[0028] like Figure 1 As shown, the mine water waste heat coupled cold storage mine air intake cooling system of the utility model includes a pretreatment section 1 connected to the mine drainage and a mine drainage water source heat pump 7. The pretreatment section 1 is connected to the desalination section and the clear water tank 6 in sequence through pipelines.

[0029] Specifically, Figure 2 As shown, the pretreatment section 1 includes a regulating pre-sedimentation tank 1-1 connected to the mine drainage, the regulating pre-sedimentation tank 1-1 is connected to a pipeline mixer 1-3 for adding a coagulant and a labyrinth water purifier 1-4 for adding a flocculant in sequence through pipelines, and a lifting pump 1-2 is arranged on the connecting pipeline between the regulating pre-sedimentation tank 1-1 and the pipeline mixer 1-3; the bottom of the labyrinth water purifier 1-4 is connected to a sludge thickening tank 1-6 through a pipeline, and the bottom of the regulating pre-sedimentation tank 1-1 is also connected to the sludge thickening tank 1-6 through a pipeline.

[0030] That is, the pretreatment section 1 adopts a combined process of the regulating pre-sedimentation tank 1-1 and the labyrinth water purifier 1-4. The high-salt mine drainage turbid water from the coal mine first enters the regulating pre-sedimentation tank 1-1. After the large suspended particles are precipitated in the regulating pre-sedimentation tank 1-1, the produced water enters the labyrinth water purifier 1-4 after being pressurized by the lifting pump 1-2. Coagulants and flocculants are added to the pipeline mixer 1-3 and the labyrinth water inlet 1-4 before the labyrinth water inlet 1-4 to remove most of the suspended matter, colloidal coagulation precipitation and part of the floating oil. The produced water of the labyrinth water purifier 1-4 flows into the pretreatment water production tank by gravity, and then enters the desalination section to remove the salt in the mine water. The sludge produced by the regulating pre-sedimentation tank 1-1 and the labyrinth water purifier 1-4 enters the sludge concentration tank 1-6, and is transported out after being dehydrated by filter pressing.

[0031] like Figure 3 As shown, the desalination section includes a desalination section pre-treatment facility 2, an ultrafiltration device 3 and a reverse osmosis device 5 which are sequentially connected through pipelines, and a clean water tank 6 is connected through a pipeline to a mine air inlet heat exchanger 10 for cooling the mine air inlet.

[0032] The desalination section serves the purpose of further removing salt from the mine water. It uses a high-efficiency clarifier 2-1, a V-type filter 2-2, an ultrafiltration 3 and a reverse osmosis device 5. The reverse osmosis device 5 is provided with a reverse osmosis membrane. Considering that the total dissolved solids and hardness of the raw water from the pretreatment water production pool of the pretreatment section 1 are relatively high, it is continuously concentrated in the reverse osmosis membrane element. When it exceeds its solubility limit, it will scale on the reverse osmosis membrane surface. After scaling, the reverse osmosis membrane will have a decrease in water production, an increase in the pressure difference between sections, and a decrease in the desalination rate. In severe cases, it will cause the system to paralyze. Therefore, a high-efficiency clarifier 2-1 and a V-type filter 2-2 are added before the ultrafiltration 3 and the reverse osmosis device 5, and the hardness of the water is reduced by adding softening agents (lime, soda ash, etc.). The salty mine water at the outlet of the V-type filter 2-2 enters the ultrafiltration 3, and the ultrafiltration membrane with a very small pore size is used to filter out the macromolecular substances and suspended matter in the incoming water, reducing the filtration burden of the subsequent reverse osmosis device 5, protecting the reverse osmosis membrane, and extending the service life of the reverse osmosis membrane. Reverse osmosis removes salt from the water from ultrafiltration 3, and the resulting clean water enters the clean water tank 6, where the concentrated water is further treated.

[0033] The load side of the mine drainage water source heat pump 7 is connected to the mine water heater 4 through a pipeline. The mine water heater 4 is located between the ultrafiltration 3 and the reverse osmosis device 5. The mine water heater 4 forms a loop connection with the load side of the mine drainage water source heat pump 7, that is, the water outlet of the load side of the mine drainage water source heat pump 7 is connected to the water inlet of the mine water heater 4, and the water outlet of the mine water heater 4 is connected to the water inlet of the load side of the mine drainage water source heat pump 7. The heat on the load side of the mine drainage water source heat pump 7 is used to heat the mine water before the inlet of the reverse osmosis device 5, so that the water temperature of the mine water is increased before entering the reverse osmosis device 5, the operating performance of the reverse osmosis membrane is improved, and the water output after the treatment of the reverse osmosis device 5 is increased.

[0034] The source side of the mine drainage water source heat pump 7 is connected to the mine water waste heat recovery heat exchanger 8 through a pipeline, and the mine water waste heat recovery heat exchanger 8 cools the water source flowing from the clear water tank 6 to the mine air inlet heat exchanger 10. The cooled water source flows to the mine air inlet heat exchanger 10 to exchange heat and cool the natural wind that enters the mine in advance, so that the temperature of the wind entering the mine is appropriate, avoiding the high temperature inside the mine causing physical discomfort to the workers, and making full use of existing resources and improving the utilization rate of existing resources.

[0035] At the same time, the medium water on the source side of the mine drainage water source heat pump 7 is heated by the mine water waste heat recovery heat exchanger 8 and then returns to the mine drainage water source heat pump 7 to exchange heat with the medium water on the load side. That is, the heat in the clean water at the end of the mine water treatment process is recovered and improved, and is preferentially used to heat the reverse osmosis water at the front end of the mine water treatment process, thereby reducing the energy consumption of the system.

[0036] Example 2

[0037] On the basis of Example 1, the load side of the mine drainage water source heat pump 7 of the mine air intake cooling system with mine water waste heat coupled cold storage in the utility model is also connected to one side of the bathing heat exchanger 11 through a pipeline, and one end of the other side of the bathing heat exchanger 11 is connected to a water source, and the other end is connected to a bathing hot water tank 12.

[0038] The mine drainage water source heat pump 7 is circularly connected to one side of the bathing heat exchanger 11, that is, the outlet of the mine drainage water source heat pump 7 on the load side is connected to the inlet of the bathing heat exchanger 11, and the outlet of the bathing heat exchanger 11 is connected to the water inlet of the mine drainage water source heat pump 7. The heat on the load side of the mine drainage water source heat pump 7 is used to heat the bathing water, so that the staff can directly use hot water for washing during shift changes.

[0039] In order to make full use of the heat on the load side of the mine drainage water source heat pump 7 and give priority to heating the mine water heater 4, a valve a16 is provided on the pipe connecting the load side outlet of the mine drainage water source heat pump 7 and the water inlet of the mine water heater 4, and a valve b17 is provided on the pipe connecting the load side outlet of the mine drainage water source heat pump 7 and the water inlet of the bathing heat exchanger 11.

[0040] Meanwhile, a temperature detector 13 is arranged on the connecting pipe between the mine water heater 4 and the reverse osmosis device 5 . The probe of the temperature detector 13 is placed in the pipe to detect the temperature of the mine water entering the reverse osmosis device 5 .

[0041] When the mine water is heated normally, valve a16 is in the open state and valve b17 is in the closed state. When the probe of the temperature detector 13 detects that the temperature of the mine water entering the reverse osmosis device 5 has reached the optimal treatment water temperature, valve b17 is opened and the openings of valves a16 and b17 are controlled to allow the heat on the load side of the mine drainage water source heat pump 7 to flow to the bathing heat exchanger 11.

[0042] Example 3

[0043] On the basis of Example 2, the connecting pipes of the mine water waste heat recovery heat exchanger 8 and the mine air inlet heat exchanger 10 of the mine water waste heat coupled cold storage mine air inlet cooling system of the utility model are connected to a cold storage tank 9 through a pipe, and the water outlet of the cold storage tank 9 is connected to the connecting pipes of the mine water waste heat recovery heat exchanger 8 and the mine air inlet heat exchanger 10 through a pipe.

[0044] By connecting the cold storage tank 9, the mine water cooled by the mine water waste heat recovery heat exchanger 8 is stored. When the temperature is high during the day and the water supply of the clear water tank 6 is small, the low-temperature mine water transported only by the clear water tank 6 is difficult to reduce the air entering the mine to a suitable temperature. At this time, the cold storage tank 9 is used to supplement the cold source of the mine air inlet heat exchanger 10 to reduce the air entering the mine to a suitable temperature.

[0045] An inlet valve 14 is provided on the connecting pipe of the mine water waste heat recovery heat exchanger 8 and the mine air intake heat exchanger 10 and the water inlet connecting pipe of the cold storage tank 9, and an outlet valve 15 is provided on the connecting pipe of the mine water waste heat recovery heat exchanger 8 and the mine air intake heat exchanger 10 and the water outlet connecting pipe of the cold storage tank 9. By manipulating the switch of the inlet valve 14 and the outlet valve 15, the cold source storage or release of the cold storage tank 9 is realized.

Claims

1. A mine air cooling system with waste heat from mine water coupled with cold storage, characterized in that: The invention comprises a pretreatment section (1) connected to mine drainage and a mine drainage water source heat pump (7); the pretreatment section (1) is connected to a desalination section and a clear water tank (6) in sequence through a pipeline; the desalination section comprises a desalination section pre-treatment facility (2), an ultrafiltration (3) and a reverse osmosis device (5) in sequence through a pipeline; the clear water tank (6) is connected to a mine air intake heat exchanger (10) for cooling the mine air intake through a pipeline; The load side of the mine drainage water source heat pump (7) is connected to a mine water heater (4) via a pipeline, and the mine water heater (4) is located between the ultrafiltration (3) and the reverse osmosis device (5). The source side of the mine drainage water source heat pump (7) is connected to a mine water waste heat recovery heat exchanger (8) via a pipeline, and the mine water waste heat recovery heat exchanger (8) cools down the water source flowing from the clear water tank (6) to the mine air inlet heat exchanger (10).

2. The mine air inlet cooling system with mine water waste heat coupled cold storage according to claim 1 is characterized in that: The pretreatment section (1) comprises a regulating pre-sedimentation tank (1-1) connected to the mine drainage, the regulating pre-sedimentation tank (1-1) is sequentially connected to a pipeline mixer (1-3) for adding a coagulant and a labyrinth water purifier (1-4) for adding a flocculant through pipelines, the bottom of the labyrinth water purifier (1-4) is connected to a sludge thickening tank (1-6) through a pipeline, and the bottom of the regulating pre-sedimentation tank (1-1) is also connected to the sludge thickening tank (1-6) through a pipeline.

3. The mine air inlet cooling system with mine water waste heat coupled cold storage according to claim 2 is characterized in that: A lifting pump (1-2) is provided between the regulating pre-sedimentation tank (1-1) and the pipeline mixer (1-3).

4. The mine air intake cooling system with mine water waste heat coupled cold storage according to claim 1 is characterized in that: The desalination section pre-treatment facility (2) comprises a high-efficiency clarification tank (2-1) connected to the pre-treatment section (1); the high-efficiency clarification tank (2-1) is connected to a V-type filter (2-2) via a pipeline; the V-type filter (2-2) is connected to an ultrafiltration (3) via a pipeline.

5. The mine air inlet cooling system with mine water waste heat coupled cold storage according to any one of claims 1 to 4, characterized in that: The load side of the mine drainage water source heat pump (7) is also connected to one side of a bathing heat exchanger (11) through a pipeline, and the other side of the bathing heat exchanger (11) is connected to a water source at one end and to a bathing hot water tank (12) at the other end.

6. The mine air inlet cooling system with mine water waste heat coupled cold storage according to claim 5 is characterized in that: A valve a (16) is provided on the pipe connecting the load side outlet of the mine drainage water source heat pump (7) and the water inlet of the mine water heater (4), and a valve b (17) is provided on the pipe connecting the load side outlet of the mine drainage water source heat pump (7) and the water inlet of the bathing heat exchanger (11).

7. The mine air inlet cooling system with mine water waste heat coupled cold storage according to claim 6 is characterized in that: A temperature detector (13) is provided on the pipeline connecting the mine water heater (4) and the reverse osmosis device (5); a probe of the temperature detector (13) is placed in the pipeline for detecting the inlet water temperature of the reverse osmosis device (5).

8. The mine air inlet cooling system with mine water waste heat coupled cold storage according to any one of claims 1 to 4, characterized in that: The connecting pipes of the mine water waste heat recovery heat exchanger (8) and the mine air intake heat exchanger (10) are connected to a cold storage tank (9) through a pipe, and the water outlet of the cold storage tank (9) is connected to the connecting pipes of the mine water waste heat recovery heat exchanger (8) and the mine air intake heat exchanger (10) through a pipe.

9. The mine water waste heat coupled cold storage mine air intake cooling system according to claim 8, characterized in that: An inlet valve (14) is provided on the connecting pipe of the mine water waste heat recovery heat exchanger (8) and the mine air intake heat exchanger (10) and the water inlet connecting pipe of the cold storage tank (9), and an outlet valve (15) is provided on the connecting pipe of the mine water waste heat recovery heat exchanger (8) and the mine air intake heat exchanger (10) and the water outlet connecting pipe of the cold storage tank (9).

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