Underground and underground combined hypersalinity mine water treatment system

Abstract

The invention provides an underground combined hypersalinity mine water treatment system. The underground combined hypersalinity mine water treatment system comprises an underground water treatment system and an underground mine water heat exchange system, the underground water treatment system mainly comprises a high-position adjusting tank, a multi-stage ultrafiltration device, a flocculation sedimentation tank, a diaphragm filter press and a tail-end ultrafiltration device; the ground mine water heat exchange system mainly comprises a condenser, a brackish water reverse osmosis device, a seawater desalination reverse osmosis device, a disc tube type reverse osmosis device, a heat pump exchange system and a crystal separator. The underground space, terrain height difference and hydrothermal resources are fully utilized, heat energy is obtained through the water source heat pump to serve as a preheating heat source for evaporation and crystallization of the strong brine, and underground and underground combined treatment, low-carbon and low-cost desalination and resource utilization of the high-salinity mine water are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of mine water treatment, relates to mine water treatment equipment, and specifically relates to an above-and-below combined high-mineralization mine water treatment system. Background Art

[0002] Mine water is a special type of groundwater produced during coal mining, which is characterized by high mineralization, high dissolved solids content and low water quality. Due to its high concentration of minerals and dissolved solids, direct discharge will have a serious impact on the environment and also waste precious water resources. Therefore, the treatment and reuse of mine water has become an issue that must be addressed by the coal mining industry.

[0003] At present, the treatment of mine water mainly adopts the traditional pretreatment process, namely coagulation sedimentation + chemical precipitation removal + filtration + ultrafiltration process. After large-scale application, this process can effectively remove most of the suspended matter and colloidal substances in mine water, but its large footprint, tight land for water treatment station expansion, large amount of reagent addition, difficulty in intelligent transformation, and complex operation and management have gradually been exposed. In addition, traditional deep treatment methods for mine water, such as multi-stage membrane concentration plus evaporation crystallization, can achieve zero discharge of mine water, but their high energy consumption and high cost cannot meet the needs of modern mining for low-carbon environmental protection and resource recycling.

[0004] In practical applications, the above-mentioned existing mine water treatment technologies have the following major problems: First, the traditional pretreatment process occupies a large area, and the land for water treatment station expansion is tight, which is not conducive to saving land resources; second, the amount of reagents added is large, which increases the treatment cost and the risk of secondary pollution; third, the intelligent transformation is difficult, and the operation and management are complicated, which is not conducive to improving the treatment efficiency; fourth, the above-and-below treatment, especially the zero-emission energy consumption of multi-stage membrane concentration plus evaporation crystallization, is high, and the cost remains high, which cannot meet the modern mining industry's demand for low-carbon environmental protection and resource recycling. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a high-mineralization mine water treatment system that is integrated above and below the shaft, so as to solve the technical problems that the traditional pretreatment process of the high-mineralization mine water treatment system in the prior art occupies a large area, has low treatment efficiency, and cannot meet the needs of modern mining for low-carbon environmental protection and resource recycling.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0007] A combined underground and underground high-mineralization mine water treatment system comprises an underground water treatment system and an above-ground mine water heat exchange system.

[0008] The underground water treatment system comprises a high-level regulating tank, the water outlet of the high-level regulating tank is connected to the water inlet of the water inlet pipe of the multi-stage ultrafiltration device, the water outlet of the water inlet pipe of the multi-stage ultrafiltration device is connected to the water inlet of the multi-stage ultrafiltration device; the water outlet of the multi-stage ultrafiltration device is connected to the water inlet of the underground water main pipeline, the water outlet of the underground water main pipeline is connected to the water inlet of the water production tank inlet pipe, the water outlet of the water production tank inlet pipe is connected to the water inlet of the water production tank, the first water outlet of the water production tank is connected to the water inlet of the mine water heat exchange system above the well; the concentrated water outlet of the multi-stage ultrafiltration device is connected to the underground water main pipeline ... The water inlet end of the concentrate main pipeline is connected, the water outlet end of the underground concentrate main pipeline is connected to the first water inlet end of the flocculation sedimentation tank, the water outlet end of the flocculation sedimentation tank is connected to the water inlet end of the diaphragm filter press, the water outlet end of the diaphragm filter press is connected to the water inlet end of the filter press outlet pipeline, the water outlet end of the filter press outlet pipeline is connected to the water inlet end of the terminal ultrafiltration device, the water outlet end of the terminal ultrafiltration device is connected to the water inlet end of the water production tank inlet pipeline; the concentrate outlet end of the terminal ultrafiltration device is connected to the water inlet end of the flocculation sedimentation tank return pipeline, and the water outlet end of the flocculation sedimentation tank return pipeline is connected to the second water inlet end of the flocculation sedimentation tank.

[0009] The above-ground mine water heat exchange system comprises a ground raw water tank, the water inlet end of the ground raw water tank is connected to the water outlet end of the above-ground mine water heat exchange system, the water outlet end of the ground raw water tank is connected to the water inlet end of the condenser; the first water outlet end of the condenser is connected to the water inlet end of the condensate outlet pipe, the water outlet end of the condensate outlet pipe is connected to the water inlet end of the brackish water reverse osmosis device, the concentrated water outlet end of the brackish water reverse osmosis device is connected to the water inlet end of the seawater desalination reverse osmosis device, the concentrated water outlet end of the seawater desalination reverse osmosis device is connected to the water inlet end of the disc-tube reverse osmosis device, and the concentrated water outlet end of the disc-tube reverse osmosis device is connected to the insulation water tank. The first water inlet end of the well is connected; the water outlet end of the brackish water reverse osmosis device, the water outlet end of the seawater desalination reverse osmosis device, and the water outlet end of the disc-tube reverse osmosis device are all connected to the water inlet end of the well water production main pipeline, and the water outlet end of the well water production main pipeline is connected to the first water inlet end of the well fresh water production tank; the second water outlet end of the condenser is connected to the first water inlet end of the first pipeline of the water source heat pump, the water outlet end of the first pipeline of the water source heat pump is connected to the first water inlet end of the first evaporator, the first water outlet end of the first evaporator is connected to the water inlet end of the second pipeline of the water source heat pump, and the water outlet end of the second pipeline of the water source heat pump is connected to the condenser The second water inlet end is connected; the first water outlet end of the insulated water tank is connected to the second water inlet end of the first evaporator, the second water outlet end of the first evaporator is connected to the water inlet end of the return pipe of the insulated water tank, and the water outlet end of the return pipe of the insulated water tank is connected to the second water inlet end of the insulated water tank; the second water outlet end of the insulated water tank is connected to the water inlet end of the preheated concentrated brine delivery pipe, the water outlet end of the preheated concentrated brine delivery pipe is connected to the first water inlet end of the crystallizer separator, the steam outlet end of the crystallizer separator is connected to the steam inlet end of the crystallizer separator steam delivery pipe, and the water outlet end of the crystallizer separator steam delivery pipe is connected to the water inlet end of the second evaporator. The first water outlet end of the second evaporator is connected to the water inlet end of the second evaporator water outlet pipe, and the water outlet end of the second evaporator water outlet pipe is connected to the second water inlet end of the fresh water production tank on the well; the first water outlet end of the crystallizer is connected to the water inlet end of the second evaporator, the second water outlet end of the second evaporator is connected to the water inlet end of the crystallizer return pipe, and the water outlet end of the crystallizer return pipe is connected to the second water inlet end of the crystallizer; the second water outlet end of the crystallizer is connected to the water inlet end of the crystallization salt concentrate pipe, and the water outlet end of the crystallization salt concentrate pipe is connected to the crystallization salt concentrate storage tank.

[0010] The present invention also has the following technical features:

[0011] The multi-stage ultrafiltration device comprises a primary ultrafiltration device, a secondary ultrafiltration device and a tertiary ultrafiltration device which are connected in sequence, wherein the water production outlet ends of the primary ultrafiltration device, the secondary ultrafiltration device and the tertiary ultrafiltration device are all connected to the water inlet end of the underground water production main pipeline, and the concentrate water outlet ends of the primary ultrafiltration device, the secondary ultrafiltration device and the tertiary ultrafiltration device are all connected to the water inlet end of the underground concentrate water main pipeline.

[0012] The structures of the first-stage ultrafiltration device, the second-stage ultrafiltration device, the third-stage ultrafiltration device and the terminal ultrafiltration device are the same; the first-stage ultrafiltration device comprises a sealed ultrafiltration box, in which a flat ceramic membrane is arranged, and the top and bottom ends of the flat ceramic membrane are fixed by a fixing frame; the top end of the flat ceramic membrane is connected to a plurality of ultrafiltration water production branches, and the water outlet ends of the plurality of ultrafiltration water production branches are connected to the underground water production main pipeline; the top and bottom ends of the flat ceramic membrane are provided with ceramic membrane plugs.

[0013] The second water outlet of the water production box is connected to the water inlet of the backwash pipe, and the water outlet of the backwash pipe is connected to the water inlet of the underground water production main pipe; a backwash pump is arranged on the backwash pipe.

[0014] The downhole water treatment system also includes an aeration pipeline, an aeration blower is arranged at the air inlet of the aeration pipeline, and the air outlet of the aeration pipeline is connected to the air inlet of the first ultrafiltration device, the second ultrafiltration device, the third ultrafiltration device and the terminal ultrafiltration device.

[0015] The condensate outlet pipe is provided with a high-pressure pump.

[0016] A water source heat pump compressor is arranged on the first pipeline of the water source heat pump.

[0017] The preheated concentrated brine delivery pipeline is provided with a crystal salt inlet pump.

[0018] A steam compressor is arranged on the steam delivery pipeline of the crystallization separator.

[0019] A feed pump is arranged on the return water pipeline of the crystallization separator; and a discharge pump is arranged on the crystallization salt concentrate pipeline.

[0020] Compared with the prior art, the present invention has the following technical effects:

[0021] (I) The present invention adopts a method of joint treatment above and below the well, making full use of the space above and below the well, the terrain difference and the thermal energy resources in the mine water, improving the treatment efficiency and reducing the water treatment cost; at the same time, by adopting multi-stage membrane concentration and reduction and MVR evaporation and crystallization technology, low-carbon and high-efficiency treatment and resource utilization of high-mineralized mine water are achieved. In addition, the present invention also focuses on water quality control and reuse, so that the treated mine water can be widely used in multiple fields, realizing the recycling of water resources. The present invention makes full use of the underground space, terrain height difference and hydrothermal resources, and obtains heat energy through a water source heat pump as a pre-heating heat source for the evaporation and crystallization of concentrated brine, realizing the joint treatment of high-mineralized mine water above and below the well, as well as low-carbon, low-cost desalination and resource utilization.

[0022] (II) The underground water treatment system of the present invention adopts a non-powered rotating cross-flow flat ceramic membrane direct filtration device, which replaces the coagulation sedimentation and filtration unit of the traditional process, and has a shorter process, stronger system reliability and lower energy consumption. The underground water treatment system of the present invention adopts "regulating tank + three-stage ceramic membrane direct filtration process + diaphragm filter press", which occupies less space, has higher filtration accuracy and better water output effect than the traditional process, and can fully meet the water inlet requirements of reverse osmosis. There is no need to specially set up an external pressure ultrafiltration protection reverse osmosis device, which saves investment, reduces operating costs, and is more conducive to the stable operation of the system.

[0023] (III) Compared with the traditional downhole water pretreatment system, the downhole water treatment system of the present invention does not need to add coagulants and flocculants, saving the cost of chemicals. At the same time, when the produced water enters the desalination system, there is no need to worry about the impact of the chemicals on the reverse osmosis membrane, which reduces the flocculation and fouling of the reverse osmosis membrane and extends its service life.

[0024] (IV) The underground water treatment system of the present invention adopts a cross-flow flat ceramic structure in the first three stages of the underground pretreatment station during pretreatment. By adjusting the membrane flux of different stages, it is always maintained within a relatively ideal pollution load tolerance range. Compared with the traditional dead-end filtration process, it can alleviate membrane pollution to the greatest extent and extend the overall service life of the ultrafiltration system; the fourth stage ultrafiltration adopts dead-end filtration, but the treatment object is replaced by the supernatant of the diaphragm filter press, and the long-term stable operation of the fourth stage membrane system is ensured by controlling the water quality of the inlet water.

[0025] (V) The above-ground mine water heat exchange system of the present invention adopts a screw-type high-temperature water source heat pump to extract heat for heating the concentrated brine to be evaporated and crystallized, thereby achieving energy saving and carbon reduction in the evaporation and crystallization of the concentrated brine, and reducing the energy consumption and cost of water treatment.

[0026] (VI) The above-ground mine water heat exchange system of the present invention adopts multi-stage membrane concentration to treat the high-mineralization mine water after heat exchange and cooling. Due to the reduction of the inlet water temperature, the desalination efficiency under the same pressure and operating conditions is significantly improved, the desalination system operates more stably and efficiently, and indirectly reduces the desalination cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of the high-mineralization mine water treatment system that is integrated above and below the well.

[0028] Figure 2 Schematic diagram of the structure of the ultrafiltration device (taking a first-stage ultrafiltration device as an example). Figure 2 (a) is a schematic diagram of the internal structure of the ultrafiltration device. (b) is Figure 2 (a) A-A' cross-section.

[0029] Figure 3 This is a schematic diagram of the water treatment process flow of the high-mineralization mine water treatment system that is integrated above and below the well.

[0030] Figure 4 This is a schematic diagram of the crystallization evaporation process flow of the high-mineralization mine water treatment system that is integrated above and below the well.

[0031] Figure 5 This is the process flow chart of ultrafiltration treatment in an underground mine in Ordos.

[0032] Figure 6 This is the material balance and water balance diagram of ultrafiltration treatment in an underground mine in Ordos.

[0033] The meanings of the numbers in the figure are as follows: 1-high-level regulating tank, 2-water inlet pipeline of multi-stage ultrafiltration device, 3-downhole water production main pipeline, 4-water production tank inlet pipeline, 5-water production tank, 6-downhole concentrated water main pipeline, 7-flocculation sedimentation tank, 8-diaphragm filter press, 9-filter press outlet pipeline, 10-terminal ultrafiltration device, 11-flocculation sedimentation tank reflux pipeline, 12-first-stage ultrafiltration device, 13-second-stage ultrafiltration device, 14-third-stage ultrafiltration device, 15-backwash pipeline, 16-backwash pump, 17-ultrafiltration water inlet pressure control valve, 18-aeration pipeline, 19-aeration blower, 20-mud cake transport vehicle; 21-ground raw water tank, 22-condenser, 23-condensate outlet pipeline, 24-brackish water reverse osmosis device, 25-seawater desalination reverse osmosis device, 26-seawater desalination reverse osmosis device, 27-seawater desalination reverse osmosis device, 28-seawater desalination reverse osmosis device, 29-seawater desalination reverse osmosis device, 30-seawater desalination reverse osmosis device, 31-seawater desalination reverse osmosis device, 32-seawater desalination reverse osmosis device, 33-seawater desalination reverse osmosis device, 34-seawater desalination reverse osmosis device, 35-seawater desalination reverse osmosis device, 36-seawater desalination reverse osmosis device, 37-seawater desalination reverse osmosis device, 38-seawater desalination reverse osmosis device, 39-seawater desalination reverse osmosis device, 40-seawater desalination reverse osmosis 6-disc-tube reverse osmosis device, 27-insulated water tank, 28-well water production main pipeline, 29-well fresh water production tank, 30-water source heat pump first pipeline, 31-first evaporator, 32-water source heat pump second pipeline, 33-insulated water tank return pipeline, 34-preheated brine delivery pipeline, 35-crystallizer, 36-crystallizer steam delivery pipeline, 37-second evaporator, 38-second evaporator outlet pipeline, 39-crystallizer return pipeline, 40-crystallized salt concentrate pipeline, 41-crystallized salt concentrate storage tank, 42-high-pressure pump, 43-water source heat pump compressor, 44-crystallized salt inlet pump, 45-steam compressor, 46-feed pump, 47-discharge pump; 48-well upper and lower water treatment system connecting pipeline, 49-valve.

[0034] 201-sealed ultrafiltration box, 202-flat ceramic membrane, 203-fixed frame, 204-ultrafiltration water production branch pipe, 205-ceramic membrane plug, 206-diaphragm plug.

[0035] The meanings of the English abbreviations in the figure are: BWRO-brackish water reverse osmosis unit, SWRO-seawater desalination reverse osmosis unit, DTRO-disc tube reverse osmosis.

[0036] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0037] It should be noted that all components and devices in the present invention, unless otherwise specified, are components and devices known in the art, such as:

[0038] The first evaporator 31 and the second evaporator 37 are conventional MVR (mechanical vapor recompression) evaporators known in the prior art.

[0039] The first-stage ultrafiltration device 12, the second-stage ultrafiltration device 13 and the third-stage ultrafiltration device 14 adopt conventional external filtration type non-powered flat ceramic ultrafiltration devices known in the prior art.

[0040] The terminal ultrafiltration device 10 adopts a conventional negative pressure suction ceramic ultrafiltration device known in the prior art.

[0041] It should be noted that, in the present invention, valves 49 are provided on all pipelines according to actual needs.

[0042] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0043] Embodiment 1:

[0044] This embodiment provides a downhole water treatment system, such as Figure 1 As shown, it includes a high-level regulating tank 1, the water outlet end of the high-level regulating tank 1 is connected to the water inlet end of the water inlet pipe 2 of the multi-stage ultrafiltration device, and the water outlet end of the water inlet pipe 2 of the multi-stage ultrafiltration device is connected to the water inlet end of the multi-stage ultrafiltration device; the water outlet end of the multi-stage ultrafiltration device is connected to the water inlet end of the underground water production main pipeline 3, the water outlet end of the underground water production main pipeline 3 is connected to the water inlet end of the water production tank inlet pipe 4, the water outlet end of the water production tank inlet pipe 4 is connected to the water inlet end of the water production tank 5, and the first water outlet end of the water production tank 5 is connected to the water inlet end of the mine water heat exchange system above ground.

[0045] like Figure 1 As shown, the concentrate outlet end of the multi-stage ultrafiltration device is connected to the water inlet end of the underground concentrate main pipeline 6, the water outlet end of the underground concentrate main pipeline 6 is connected to the first water inlet end of the flocculation sedimentation tank 7, the water outlet end of the flocculation sedimentation tank 7 is connected to the water inlet end of the membrane filter press 8, the water outlet end of the membrane filter press 8 is connected to the water inlet end of the filter press outlet pipeline 9, the water outlet end of the filter press outlet pipeline 9 is connected to the water inlet end of the terminal ultrafiltration device 10, the water production outlet end of the terminal ultrafiltration device 10 is connected to the water inlet end of the water production tank inlet pipeline 4; the concentrate outlet end of the terminal ultrafiltration device 10 is connected to the water inlet end of the flocculation sedimentation tank return pipeline 11, and the water outlet end of the flocculation sedimentation tank return pipeline 11 is connected to the second water inlet end of the flocculation sedimentation tank 7.

[0046] As a specific solution of this embodiment, Figure 1 As shown, the multi-stage ultrafiltration device includes a primary ultrafiltration device 12, a secondary ultrafiltration device 13 and a tertiary ultrafiltration device 14 which are connected in sequence, the produced water outlet ends of the primary ultrafiltration device 12, the secondary ultrafiltration device 13 and the tertiary ultrafiltration device 14 are all connected to the water inlet end of the underground water production main pipeline 3, and the concentrated water outlet ends of the primary ultrafiltration device 12, the secondary ultrafiltration device 13 and the tertiary ultrafiltration device 14 are all connected to the water inlet end of the underground concentrated water main pipeline 6.

[0047] As a specific solution of this embodiment, Figure 2 As shown, the structures of the first-stage ultrafiltration device 12, the second-stage ultrafiltration device 13, the third-stage ultrafiltration device 14 and the terminal ultrafiltration device 10 are the same; the first-stage ultrafiltration device 12 includes a sealed ultrafiltration box 201, in which a flat ceramic membrane 202 is arranged, and the top and bottom ends of the flat ceramic membrane 202 are fixed by a fixing frame 203; the top of the flat ceramic membrane 202 is connected to a plurality of ultrafiltration water production branch pipes 204, and the water outlet ends of the plurality of ultrafiltration water production branch pipes 204 are connected to the underground water production main pipeline 3; the top and bottom ends of the flat ceramic membrane 202 are provided with ceramic membrane plugs 205.

[0048] In this embodiment, water inlet pipes and series branches are respectively provided on both sides of the ultrafiltration device, the water inlet pipe of the first-stage ultrafiltration device 12 is connected to the multi-stage water inlet pipe 2, the series branch of the first-stage ultrafiltration device 12 is connected to the water inlet pipe of the second-stage ultrafiltration device 13, and the series branch of the second-stage ultrafiltration device 13 is connected to the water inlet pipe of the tertiary ultrafiltration device 14; the water inlet pipe of the terminal ultrafiltration device 10 is connected to the water outlet pipe 9 of the filter press.

[0049] As a specific solution of this embodiment, Figure 1As shown, the second water outlet of the water production tank 5 is connected to the water inlet of the backwash pipe 15, and the water outlet of the backwash pipe 15 is connected to the water inlet of the underground water production main pipe 3; a backwash pump 16 is provided on the backwash pipe 15. In this embodiment, the backwash pipe 15 and the backwash pump 16 are used to clean the membrane of the ultrafiltration device, extend the service life of the ultrafiltration device, and ensure its normal operation.

[0050] As a specific solution of this embodiment, Figure 1 As shown, an ultrafiltration water inlet pressure control valve 17 is provided on the water inlet pipe 2 of the multi-stage ultrafiltration device for controlling the circulation of raw water.

[0051] As a specific solution of this embodiment, Figure 1 As shown, the underground water treatment system also includes an aeration pipe 18, an aeration blower 19 is provided at the air inlet of the aeration pipe 18, and the air outlet end of the aeration pipe 18 is connected to the air inlet ends of the first-stage ultrafiltration device 12, the second-stage ultrafiltration device 13, the third-stage ultrafiltration device 14, and the terminal ultrafiltration device 10. In this embodiment, the aeration pipe 18 and the aeration blower 19 are used to provide gas to the ultrafiltration device so that the membrane of the ultrafiltration device can normally perform water purification operations.

[0052] As a specific solution of this embodiment, the downhole water treatment system further includes a mud cake transport vehicle 20 , which is used to transport the mud cake discharged from the membrane filter press 8 .

[0053] In this embodiment, the flat ceramic ultrafiltration membrane adopts commercially available Al2O3 or SiO2-based hollow membrane raw materials. Through the optimization design of the end structure, it has the functions of upper water outlet and lower backwashing, and can be firmly fixed on the fixing frame 203 of the first-stage ultrafiltration device 12, the second-stage ultrafiltration device 13 and the third-stage ultrafiltration device 14; wherein the upper water outlet of each diaphragm is connected to the underground water production main pipeline 3 through a quick-connect port and a connecting hose, and the lower water outlet is connected to the backwashing pipeline 15 through a quick-connect port and a connecting hose (backwashing water branch pipe). When the inlet head pressure meets the water production condition (i.e., P≥0.2kpa), the backwashing valve is closed, and the raw water overcomes the trans-membrane pressure difference and passes through the ceramic membrane, and is sequentially The water flows into the main water pipe through the water production channel and the water production branch pipe. The suspended matter and impurities in the raw water are intercepted by the membrane surface, thereby realizing the unpowered purification of the suspended matter in the mine raw water. When the pollutants on the membrane surface are enriched and the water production flow rate decreases (the water production flow rate is less than the set threshold), the water inlet valve is closed, the valve on the backwash pipe 15 is opened, and the backwash pump 16 and the aeration cleaning device are started. The backwash pump 16 runs at a fixed frequency. When the backwash time reaches the set value (that is, the membrane flux is restored), the backwash valve, the backwash pump and the aeration device are closed in turn, the water inlet valve is opened, and the next water production cycle is automatically entered. After the bottom concentrate is enriched, it is sent to the flocculation sedimentation tank 7 through the underground concentrate main pipe 6 for further concentration and then sent to the diaphragm filter press 8 for filtration.

[0054] like Figure 3 As shown, the vertical height between the high-level regulating tank 1 and the top of the first-level ultrafiltration device 12 (i.e., the downhole height difference) ΔH≥6m, and the pressure formed by the downhole height difference when the water is produced by the high-level regulating tank 1 is calculated and obtained by the following formula I:

[0055] P = ρ × g × ΔH Formula Ⅰ.

[0056] Where:

[0057] P represents the pressure formed by the water produced by the high-level regulating tank using the height difference underground, and the unit is MPa.

[0058] g represents the acceleration due to gravity, in m / s 2 , generally the value is 9.80.

[0059] ΔH represents the underground height difference, which actually means the vertical height between the high-level regulating tank 1 and the top of the first-stage ultrafiltration device 12, in meters.

[0060] Embodiment 2:

[0061] This embodiment provides a mine water heat exchange system. Figure 1 As shown, it includes a ground raw water tank 21 , the water inlet end of the ground raw water tank 21 is connected to the water outlet end of the mine water heat exchange system above the well, and the water outlet end of the ground raw water tank 21 is connected to the water inlet end of the condenser 22 .

[0062] The first water outlet end of the condenser 22 is connected to the water inlet end of the condensate outlet pipe 23, the water outlet end of the condensate outlet pipe 23 is connected to the water inlet end of the brackish water reverse osmosis device 24, the concentrate water outlet end of the brackish water reverse osmosis device 24 is connected to the water inlet end of the seawater desalination reverse osmosis device 25, the concentrate water outlet end of the seawater desalination reverse osmosis device 25 is connected to the water inlet end of the disc-tube reverse osmosis device 26, and the concentrate water outlet end of the disc-tube reverse osmosis device 26 is connected to the first water inlet end of the insulation water tank 27; the produced water outlet end of the brackish water reverse osmosis device 24, the produced water outlet end of the seawater desalination reverse osmosis device 25, and the produced water outlet end of the disc-tube reverse osmosis device 26 are all connected to the water inlet end of the well water production main pipe 28, and the water outlet end of the well water production main pipe 28 is connected to the first water inlet end of the well fresh water production tank 29.

[0063] The second water outlet end of the condenser 22 is connected to the first water inlet end of the first pipe 30 of the water source heat pump, the water outlet end of the first pipe 30 of the water source heat pump is connected to the first water inlet end of the first evaporator 31, the first water outlet end of the first evaporator 31 is connected to the water inlet end of the second pipe 32 of the water source heat pump, and the water outlet end of the second pipe 32 of the water source heat pump is connected to the second water inlet end of the condenser 22.

[0064] The first water outlet end of the insulated water tank 27 is connected to the second water inlet end of the first evaporator 31, the second water outlet end of the first evaporator 31 is connected to the water inlet end of the insulated water tank return pipe 33, and the water outlet end of the insulated water tank return pipe 33 is connected to the second water inlet end of the insulated water tank 27.

[0065] The second water outlet end of the insulated water tank 27 is connected to the water inlet end of the preheated concentrated brine delivery pipeline 34, the water outlet end of the preheated concentrated brine delivery pipeline 34 is connected to the first water inlet end of the crystallizer separator 35, the steam outlet end of the crystallizer separator 35 is connected to the steam inlet end of the crystallizer separator steam delivery pipeline 36, the water outlet end of the crystallizer separator steam delivery pipeline 36 is connected to the water inlet end of the second evaporator 37, the first water outlet end of the second evaporator 37 is connected to the water inlet end of the second evaporator water outlet pipeline 38, and the water outlet end of the second evaporator water outlet pipeline 38 is connected to the second water inlet end of the well fresh water production tank 29.

[0066] The first water outlet end of the crystal separator 35 is connected to the water inlet end of the second evaporator 37, the second water outlet end of the second evaporator 37 is connected to the water inlet end of the crystal separator return pipe 39, and the water outlet end of the crystal separator return pipe 39 is connected to the second water inlet end of the crystal separator 35.

[0067] The second water outlet end of the crystal separator 35 is connected to the water inlet end of the crystal salt concentrate pipeline 40 , and the water outlet end of the crystal salt concentrate pipeline 40 is connected to the crystal salt concentrate storage tank 41 .

[0068] In this embodiment, the mine water heat exchange system on the ground is mainly divided into three modules: the first module is a mine water heat energy recovery module, which mainly includes a condenser 22, a first water source heat pump pipeline 30, a first evaporator 31, and a second water source heat pump pipeline 32, which is used to recover the waste heat of the mine water in the mine, and transfer the heat of the mine water to the concentrated brine to be evaporated and crystallized through the first evaporator 31 for preheating; the refrigerant in the condenser 22 flows forward, and the high-temperature and high-pressure gas discharged by the water source heat pump compressor 43 enters the condenser 22 to release heat to the water in the first evaporator 31, and changes phase to a high-temperature and high-pressure liquid, and then changes into a low-temperature and low-pressure liquid through throttling and pressure reduction by a thermal expansion valve, enters the first evaporator 31, absorbs low-temperature heat from the mine water, changes phase to low-temperature and low-pressure saturated steam, and then enters the suction end of the water source heat pump compressor 43, and the high-temperature and high-pressure gas is compressed and discharged by the water source heat pump compressor 43 to complete a cycle, and the heat energy in the mine water is "transported" to the water collector in this reciprocating cycle.

[0069] The second module is a concentrated brine preheating module, which mainly includes a second evaporator 37, which is used to receive heat energy from the ground source heat pump module of the mine water recovery module, and preheat the concentrated brine before evaporation and crystallization to reduce the energy consumption of the MVR section.

[0070] The third module is a concentrated brine evaporation crystallization module, which mainly includes a set of crystallization separators 35 and its automatic control system, which are used to monitor and adjust the operating status of the crystallization separators 35 in real time to ensure the stability and efficiency of the evaporation crystallization process.

[0071] As a specific solution of this embodiment, Figure 1 As shown, a high-pressure pump 42 is provided on the condensate outlet pipe 23 .

[0072] As a specific solution of this embodiment, Figure 1 As shown, a water source heat pump compressor 43 is provided on the first pipe 30 of the water source heat pump.

[0073] As a specific solution of this embodiment, Figure 1 As shown, a crystal salt inlet pump 44 is provided on the preheated concentrated brine delivery pipeline 34 .

[0074] As a specific solution of this embodiment, Figure 1 As shown, a steam compressor 45 is provided on the crystallizer steam delivery pipeline 36 .

[0075] As a specific solution of this embodiment, Figure 1 As shown, a feed pump 46 is provided on the crystal separator return water pipe 39 .

[0076] As a specific solution of this embodiment, Figure 1 As shown, a discharge pump 47 is provided on the crystallized salt concentrate pipeline 40 .

[0077] Embodiment 3:

[0078] This embodiment provides a combined underground and underground high-mineralization mine water treatment system, including the underground water treatment system of embodiment 1 and the above-ground mine water heat exchange system of embodiment 2. The water outlet of the underground water treatment system is connected to the water inlet of the above-ground mine water heat exchange system through the underground and underground water treatment system connecting pipe 48. The water outlet of the underground water treatment system is the first water outlet of the water production tank 5.

[0079] The working process of the present invention is as follows:

[0080] First, underground pretreatment: underground, first use the underground space such as the communication tunnel to establish an underground water treatment system. After the establishment, the raw mine water at the bottom of the well is introduced into the underground raw water tank (not shown in the figure) for primary sedimentation, and then enters the high-level regulating tank 1 for water quality homogenization; the water produced by the high-level regulating tank 1 uses the pressure formed by the underground height difference ΔH≥6m (P=ρgΔH, such as Figure 3As shown in the figure, the suspended solids, non-dissolved organic matter and other impurities in the water are removed by a three-stage external filtration type unpowered ceramic ultrafiltration system composed of a first-stage ultrafiltration device 12, a second-stage ultrafiltration device 13 and a third-stage ultrafiltration device 14, and the clean water enters the underground clean water tank. After three-stage concentration, the tail water enters the flocculation sedimentation tank 7 for precipitation, and the precipitated water-containing sludge is filtered by a diaphragm filter press 8, and the mud cake is transported out. The supernatant of the filtration enters the terminal ultrafiltration device 10 (i.e., a negative pressure suction ceramic ultrafiltration system) for further filtration, and the filtrate meets the standard and enters the production water tank 5, and the concentrated liquid is discharged into the diaphragm filter press 8; the pretreated production water is transported to the ground raw water tank 21 through the underground water treatment system connecting pipe 48 and the lifting pump arranged thereon. Through the above-mentioned underground pretreatment and unpowered ultrafiltration process, the potential energy and waste heat of the underground mine water are fully utilized, and the energy consumption and environmental pollution of the water treatment process are reduced. The water level potential energy is fully utilized, the land occupation is reduced and the energy consumption is reduced, and the cost of mine water pretreatment is minimized.

[0081] Second, mine water heat exchange (i.e. heat exchange treatment of pretreated mine water on the ground): utilize the heat pump exchange system composed of the condenser 22, the first water source heat pump pipeline 30, the first evaporator 31, the second water source heat pump pipeline 32 and the water source heat pump compressor 43 (i.e. screw-type high-temperature water source heat pump technology) to extract heat from the mine water raw water. This heat can replace the traditional steam heat source. The heat extracted from the mine water raw water is used to heat the concentrated brine to be evaporated and crystallized or to replace an equivalent steam heat source, which can achieve energy saving and carbon reduction in the evaporation and crystallization of the concentrated brine.

[0082] Third, deep treatment on the ground: a multi-stage membrane concentration system consisting of a brackish water reverse osmosis device 24, a seawater desalination reverse osmosis device 25 and a disc-tube reverse osmosis device 26 is used to maximize the utilization of water resources and reduce the amount of concentrated brine. The experimental results show that for every 1°C increase in water temperature, the viscosity of the water decreases, the water permeability of the reverse osmosis membrane increases by about 2.7%, the salt diffusion rate is accelerated, the desalination rate is reduced, the system energy consumption is increased, the hydrolysis process is accelerated, the membrane is damaged, and the system stability is affected. Therefore, desalination of mine water after heat exchange and cooling will help to improve the desalination rate, reduce energy consumption and improve system stability. Through the above-mentioned low-temperature mine water desalination process, the desalination rate is improved, the energy consumption is reduced and the system stability is improved.

[0083] Fourth, concentrated brine evaporation and crystallization: After the concentration and reduction treatment, the mineralization of the concentrated brine is enriched. In order to meet the "zero discharge" requirements of mine water, the heat pump exchange system composed of the condenser 22, the first water source heat pump pipeline 30, the first evaporator 31, the second water source heat pump pipeline 32 and the water source heat pump compressor 43 is used as a supplementary heat source to preheat the concentrated brine, and the first evaporator 31 and the second evaporator 37 are used to perform segmented evaporation and crystallization on the concentrated brine after the reduction and temperature increase, and NaCl and Na2SO4 crystal salts are obtained respectively. Through the above-mentioned concentrated brine evaporation and crystallization process, the thermal energy of the mine water extracted by the water source heat pump is fully utilized, and advanced heat exchange and automatic control technologies are adopted to ensure the energy saving, stability and high efficiency of the evaporation and crystallization process.

[0084] Fifth, water quality monitoring and reuse based on classification and quality: monitor the water quality of the treated mine water reverse osmosis water and condensate water to ensure that all indicators meet the reuse requirements. The treated water can be reused in industrial production, agricultural irrigation, ecological water replenishment and other fields based on classification and quality, realizing the recycling of water resources.

[0085] In the above work process, the functions of each specific process are as follows:

[0086] exist Figure 1 and Figure 3 The first thing you can see is the underground pretreatment system A, which mainly includes a regulating tank, a multi-stage non-powered ceramic ultrafiltration short-process device, a flocculation sedimentation tank, a plate and frame filter press and other equipment. Mine water is first introduced into the regulating tank for preliminary sedimentation treatment, which is to remove larger particles in the water, such as silt, suspended particles, etc. Subsequently, the preliminarily treated water will enter the multi-stage ceramic non-powered ultrafiltration system to further remove impurities such as suspended matter in the water, so that the water quality is initially improved to SDI <5, and after pretreatment to meet the standards, it will enter the underground clear water tank.

[0087] The water treated by the underground pretreatment system will be transported to the ground deep treatment system through pipelines. In the ground deep treatment system, the heat in the mine water is first extracted by a water source heat pump. After heat extraction and cooling, the high-mineralized mine water is desalinated and concentrated and reduced by a multi-stage membrane concentration process of brackish water reverse osmosis BWRO + seawater desalination reverse osmosis SWRO + disc-tube reverse osmosis DTRO until the concentrated brine is concentrated and reduced to the minimum amount that is technically and economically feasible.

[0088] The mineralization of water treated by the ground deep treatment system has been greatly reduced, and it can meet the water quality requirements for different purposes. The treated water will be monitored by the online detection system for changes in water quality in each process section, including turbidity, conductivity, TDS, pH value, temperature, etc., to ensure that the treated water meets the requirements for reuse.

[0089] Finally, the concentrated brine after concentration and reduction enters the evaporation crystallization device, and the heat provided by the mine water source heat pump waste heat utilization system is used as pre-heating before MVR to complete crystallization evaporation and crystallized salt recovery.

[0090] pass Figure 1 and Figure 3 The display clearly shows the whole process of the method for treating high-mineralization mine water in the well and the relationship and coordination between various links. This method can effectively treat high-mineralization mine water, reduce treatment costs, improve treatment efficiency, reduce energy consumption, and realize the recycling of water resources.

[0091] pass Figure 2 and Figure 4 The display clearly shows the whole process of the underground unpowered ultrafiltration, ground water source heat pump heat exchange, multi-stage membrane concentration and concentrated brine MVR evaporation crystallization method of the present invention, as well as the relationship and coordination between various links. Different from the traditional process, this method can effectively realize the full utilization of the abandoned tunnel space in the coal mine, the water potential energy formed by the water level difference, and the waste heat of the mine water, reducing energy consumption and environmental pollution, improving energy utilization efficiency, and reducing system operation costs.

[0092] Effect verification:

[0093] Taking the mine water of a mine in Ordos as an example, the effect of the underground combined high-mineralization mine water treatment system of the present invention is verified. The underground treated water volume of the mine water (i.e., raw water) in this area is 6000m 3 / d, the designed suspended solids in the inlet water are ≤1000mg / L, and the designed effluent water quality: turbidity ≤1NTU.

[0094] The underground water treatment system mainly consists of three parts, namely the first three levels of ceramic membrane unpowered direct filtration + plate and frame filter press + fourth level ceramic membrane ultrafiltration system. The raw mine water with water level potential enters the system from the underground transfer tank, and is filtered by the first, second and third level ceramic membrane ultrafiltration systems in turn. The qualified water is sent to the central water tank at the bottom of the well, and the remaining 30% of the concentrated water enters the high-efficiency flocculation reaction inclined plate sedimentation tank, and the supernatant is sent to the fourth level ceramic membrane ultrafiltration system. The flocculated sediment after stratification enters the diaphragm filter press for filtration to achieve mud and water separation. The supernatant after filtration by the filter press enters the fourth level ceramic membrane ultrafiltration system, and the mud cake with a moisture content of 75% is transported out.

[0095] The mine water heat exchange system on the ground includes ground water source heat pump heat exchange, multi-stage membrane concentration after heat exchange, and evaporation crystallization after concentration. Finally, the mineralization of the treated water is regulated as needed and transported to the water quality monitoring station for monitoring. After the above steps, the mineralization of the mine water is greatly reduced and the water quality is significantly improved. The treated water can be reused in industrial production, agricultural irrigation, ecological water replenishment and other fields to achieve the recycling and conservation of water resources.

[0096] The actual drainage volume of a mine in Ordos is 200m 3 / h, the mine drainage temperature is 18℃, and heat is extracted from the mine drainage for 24 hours. The heat that can be extracted from the mine drainage can be determined by the following formula II:

[0097] Qps = 4.2 × Gps × (tps - tps.o) / 3.6 Formula II

[0098] Where:

[0099] Qps represents the amount of heat that can be extracted when the mine drainage temperature is reduced to 3.0°C, in kW;

[0100] GPS represents the mine drainage flow rate in m3 / h.

[0101] TPS represents the mine drainage temperature in °C.

[0102] tps.o indicates the temperature of mine drainage after heat extraction, in ℃.

[0103] According to formula II, the heat that can be extracted from mine drainage is calculated as: Qps = 4.2 × 200 × (18.0-3.0) / 3.6 = 3500kW. The heat provided by the low-temperature heat source is increased by the heat pump, and the output heat Q2 is calculated as follows: Q2 = Q1 × cop / (cop-1) = 3500 × 5.30 / 4.30 = 4314kW. The cop of the screw high-temperature water source heat pump is 5.30.

[0104] The maximum heating capacity of the waste heat from mine drainage in the mine area is 4314kW, which is equivalent to the heat supply of an 8.8t boiler. The boiler efficiency is calculated at 70%. Compared with electric boilers, it saves about 10.6724 million kWh of electricity, 5.8698 million yuan in electricity bills, about 4268.96 tons of standard coal, and reduces carbon dioxide emissions by 10640.38 tons, nitrogen oxide emissions by 160.09 tons, sulfur dioxide emissions by 320.17 tons, and dust emissions by 2902.89 tons. Compared with coal-fired boilers, it saves about 2311.44 tons of standard coal. The boiler efficiency is calculated at 70%, and carbon dioxide emissions are reduced by 6240.89 tons.

[0105] The liquid that passes through the underground water treatment system enters the mine water heat exchange system above ground; the heat pump uses the stable temperature of groundwater to exchange heat, extracting or releasing heat; the temperature of the liquid after heat exchange is adjusted to prepare for subsequent processing.

[0106] The liquid after heat exchange enters the multi-stage membrane concentration system. Through the multi-stage membrane concentration technology, the water in the liquid is gradually removed and the solute concentration is gradually increased. Each stage of membrane concentration is accompanied by the removal of water and the output of concentrated liquid until the predetermined concentration is reached. The operating pressure of the membrane concentration equipment is 0.5-1.5MPa, the operating temperature is 20-40℃, the membrane material is polyamide, and the pore size is 0.1-0.5μm. The current drainage volume of a mine in Ordos is 5000m 3 / d, using three-stage reverse osmosis membrane method to concentrate and reduce high-mineralization wastewater. In order to reduce investment and ensure that the produced water meets the surface water Class III standard and achieve the reduction of concentrated brine, the chemical defluorination process is used after the reverse osmosis of the first-stage ultrafiltration device 12. The remaining concentrated brine after reverse osmosis concentration by the three-stage ultrafiltration device 14 is finally reduced to 26.3m 3 / d.

[0107] The liquid concentrated by multi-stage membrane enters the evaporation crystallization unit. The operating pressure of the evaporation crystallization equipment is 0.1-0.5MPa, the operating temperature is 100-120℃, and the evaporation time is 2 hours. Through heating and evaporation, the water in the liquid is further removed, and the solute begins to crystallize. The crystallized product is collected and subjected to subsequent treatment such as drying and packaging, and the steam generated by evaporation may be recycled and reused through condensation. The remaining amount of concentrated brine in the mine is 26.3m 3 / d, the amount of heat required to evaporate one ton of water can be calculated as follows: Heat of evaporation per ton of water = 2260.9 kJ / kg × 1000 kg ≈ 2,260,900 kJ / ton (i.e., heat of evaporation = latent heat of evaporation × mass).

[0108] Therefore, the evaporation heat required for the daily evaporation and crystallization of concentrated brine in the mine is: 2,260,900 kJ / ton × 26.3 tons / day = 59,461,670 kJ / day. The evaporation power consumption converted to hours is approximately: 59,461,670 kJ / day ÷ 20 ÷ 3600 = 825.86 kW / h. Considering 20% ​​heat exchange loss, the required power is approximately 991 kW / h. According to the calculated mine water waste heat recovery of 4314 kW / h, the heat required for the evaporation and crystallization of concentrated brine in this project can be fully met through indirect heat exchange or equivalent replacement.

[0109] Through the above process, high-mineralization mine water can be treated with high efficiency and low consumption, solving the problems existing in traditional treatment processes. The crystallized product is output as a product after packaging and other treatments. Wastewater, waste residue and other wastes generated in the process are properly handled in accordance with environmental protection requirements. In the entire process, there should be corresponding auxiliary systems, such as pumping systems, control systems, monitoring systems, etc., to ensure the smooth progress of the process and product quality. The monitoring system should monitor the parameters of each link in real time, such as temperature, pressure, flow, concentration, etc., so as to adjust the operating parameters in time or find potential problems.

[0110] As can be seen from the above, the overall operation of the present invention has a high degree of automation and resource conservation, and realizes low-carbon and low-cost desalination of high-mineralization mine water and "zero discharge" of concentrated brine. Compared with the existing technology, the beneficial effects of the present invention are as follows: ① Save land resources: The present invention adopts a new type of underground short-process pretreatment process equipment for mine water, makes full use of underground goafs and abandoned tunnels, and occupies a small area, which can effectively save land resources and alleviate the problem of land shortage for water treatment station expansion. ② Reduce water treatment energy consumption: The present invention adopts zero-emission technology, such as underground unpowered ultrafiltration direct filtration series technology, ground water source heat pump heat exchange and concentrated brine preheating technology, etc. These technologies have low energy consumption, can make full use of mine water hydrothermal resources and effectively reduce treatment costs, and meet the needs of modern mining for low-carbon environmental protection and resource recycling. ③ Reduce treatment costs: The present invention adopts an unpowered ultrafiltration direct filtration series process underground, without the need to add chemicals, thereby avoiding the risk of secondary pollution; before ground evaporation and crystallization, it makes full use of the waste heat of mine water, saving energy and reducing treatment costs. ④ Simplify operation management: The present invention may adopt an intelligent control system and management method, which can simplify operation management, improve processing efficiency, and reduce the complexity of operation management. In general, compared with the prior art, the present invention has the advantages of small footprint, low processing cost, simple operation management, and low energy consumption, and can better meet the needs of modern mining for low-carbon environmental protection and resource recycling.

[0111] The present invention can be widely used in application fields such as mine water treatment, high-mineralization water treatment, and environmental protection engineering. First, the present invention can effectively solve the problems existing in the existing mine water treatment technology, such as large floor space, tight land for water treatment station expansion, large dosage of reagents, great difficulty in intelligent transformation, and complex operation and management, thereby improving the efficiency and quality of mine water treatment. Secondly, the present invention can effectively reduce the cost of mine water treatment, reduce the dosage of reagents, avoid the risk of secondary pollution, and is beneficial to environmental protection. Finally, the present invention can achieve zero discharge of mine water and meet the needs of modern mining for low-carbon environmental protection and resource recycling. Therefore, the present invention has broad market demand and good application prospects.

Claims

1. A combined underground and underground high-mineralization mine water treatment system, characterized in that: Including underground water treatment system and above-ground mine water heat exchange system; The underground water treatment system comprises a high-level regulating tank (1), the water outlet of the high-level regulating tank (1) is connected to the water inlet of a multi-stage ultrafiltration device water inlet pipe (2), and the water outlet of the multi-stage ultrafiltration device water inlet pipe (2) is connected to the water inlet of the multi-stage ultrafiltration device; the water outlet of the multi-stage ultrafiltration device is connected to the water inlet of an underground water production main pipe (3), the water outlet of the underground water production main pipe (3) is connected to the water inlet of a water production tank water inlet pipe (4), the water outlet of the water production tank water inlet pipe (4) is connected to the water inlet of a water production tank (5), and the first water outlet of the water production tank (5) is connected to the water inlet of an underground mine water heat exchange system; The concentrated water outlet of the multi-stage ultrafiltration device is connected to the water inlet of the underground concentrated water main pipeline (6), the water outlet of the underground concentrated water main pipeline (6) is connected to the first water inlet of the flocculation sedimentation tank (7), the water outlet of the flocculation sedimentation tank (7) is connected to the water inlet of the membrane filter press (8), the water outlet of the membrane filter press (8) is connected to the water inlet of the filter press outlet pipeline (9), the water outlet of the filter press outlet pipeline (9) is connected to the water inlet of the terminal ultrafiltration device (10), the water outlet of the terminal ultrafiltration device (10) is connected to the water inlet of the water production tank inlet pipeline (4); the concentrated water outlet of the terminal ultrafiltration device (10) is connected to the water inlet of the flocculation sedimentation tank return pipeline (11), and the water outlet of the flocculation sedimentation tank return pipeline (11) is connected to the second water inlet of the flocculation sedimentation tank (7); The above-ground mine water heat exchange system comprises a ground raw water tank (21), the water inlet end of the ground raw water tank (21) is connected to the water outlet end of the above-ground mine water heat exchange system, and the water outlet end of the ground raw water tank (21) is connected to the water inlet end of the condenser (22); The first water outlet end of the condenser (22) is connected to the water inlet end of the condensate outlet pipe (23), the water outlet end of the condensate outlet pipe (23) is connected to the water inlet end of the brackish water reverse osmosis device (24), the concentrated water outlet end of the brackish water reverse osmosis device (24) is connected to the water inlet end of the seawater desalination reverse osmosis device (25), the concentrated water outlet end of the seawater desalination reverse osmosis device (25) is connected to the water inlet end of the disc-tube reverse osmosis device (26), and the disc-tube reverse osmosis device (26) is connected to the disc-tube reverse osmosis device (26). The concentrated water outlet of the tubular reverse osmosis device (26) is connected to the first water inlet of the thermal insulation water tank (27); the water outlet of the brackish water reverse osmosis device (24), the water outlet of the seawater desalination reverse osmosis device (25), and the water outlet of the disc-tube reverse osmosis device (26) are all connected to the water inlet of the well water main pipeline (28); the water outlet of the well water main pipeline (28) is connected to the first water inlet of the well fresh water production tank (29); The second water outlet of the condenser (22) is connected to the first water inlet of the first pipe (30) of the water source heat pump, the water outlet of the first pipe (30) of the water source heat pump is connected to the first water inlet of the first evaporator (31), the first water outlet of the first evaporator (31) is connected to the water inlet of the second pipe (32) of the water source heat pump, and the water outlet of the second pipe (32) of the water source heat pump is connected to the second water inlet of the condenser (22); The first water outlet end of the insulation water tank (27) is connected to the second water inlet end of the first evaporator (31), the second water outlet end of the first evaporator (31) is connected to the water inlet end of the insulation water tank return pipe (33), and the water outlet end of the insulation water tank return pipe (33) is connected to the second water inlet end of the insulation water tank (27); The second water outlet end of the heat preservation water tank (27) is connected to the water inlet end of the preheated concentrated brine delivery pipeline (34), the water outlet end of the preheated concentrated brine delivery pipeline (34) is connected to the first water inlet end of the crystallizer (35), the steam outlet end of the crystallizer (35) is connected to the steam inlet end of the crystallizer steam delivery pipeline (36), the water outlet end of the crystallizer steam delivery pipeline (36) is connected to the water inlet end of the second evaporator (37), the first water outlet end of the second evaporator (37) is connected to the water inlet end of the second evaporator water outlet pipeline (38), and the water outlet end of the second evaporator water outlet pipeline (38) is connected to the second water inlet end of the well fresh water production tank (29); The first water outlet of the crystal separator (35) is connected to the water inlet of the second evaporator (37), the second water outlet of the second evaporator (37) is connected to the water inlet of the crystal separator return pipe (39), and the water outlet of the crystal separator return pipe (39) is connected to the second water inlet of the crystal separator (35); The second water outlet of the crystal separator (35) is connected to the water inlet of the crystal salt concentrate pipeline (40), and the water outlet of the crystal salt concentrate pipeline (40) is connected to the crystal salt concentrate storage tank (41).

2. The above-and-below combined high-mineralization mine water treatment system according to claim 1, characterized in that: The multi-stage ultrafiltration device comprises a primary ultrafiltration device (12), a secondary ultrafiltration device (13) and a tertiary ultrafiltration device (14) which are connected in sequence, wherein the water production outlets of the primary ultrafiltration device (12), the secondary ultrafiltration device (13) and the tertiary ultrafiltration device (14) are all connected to the water inlet of the underground water production main pipeline (3), and the concentrated water outlets of the primary ultrafiltration device (12), the secondary ultrafiltration device (13) and the tertiary ultrafiltration device (14) are all connected to the water inlet of the underground concentrated water main pipeline (6).

3. The above-and-below combined high-mineralization mine water treatment system according to claim 2, characterized in that: The structures of the first-stage ultrafiltration device (12), the second-stage ultrafiltration device (13), the third-stage ultrafiltration device (14) and the terminal ultrafiltration device (10) are the same; the first-stage ultrafiltration device (12) comprises a sealed ultrafiltration housing (201), a flat ceramic membrane (202) is arranged inside the sealed ultrafiltration housing (201), and the top and bottom ends of the flat ceramic membrane (202) are fixed by a fixing frame (203); the top end of the flat ceramic membrane (202) is connected to a plurality of ultrafiltration water production branch pipes (204), and the water outlet ends of the plurality of ultrafiltration water production branch pipes (204) are connected to the underground water production main pipeline (3); the top and bottom ends of the flat ceramic membrane (202) are provided with ceramic membrane plugs (205).

4. The above-and-below combined high-mineralization mine water treatment system according to claim 1, characterized in that: The second water outlet of the water production tank (5) is connected to the water inlet of the backwash pipe (15), and the water outlet of the backwash pipe (15) is connected to the water inlet of the underground water production main pipe (3); a backwash pump (16) is provided on the backwash pipe (15).

5. The above-and-below combined high-mineralization mine water treatment system according to claim 1, characterized in that: The downhole water treatment system further comprises an aeration pipe (18), an aeration blower (19) is arranged at the air inlet of the aeration pipe (18), and the air outlet end of the aeration pipe (18) is connected to the air inlet ends of the first-stage ultrafiltration device (12), the second-stage ultrafiltration device (13), the third-stage ultrafiltration device (14), and the terminal ultrafiltration device (10).

6. The above-and-below combined high-mineralization mine water treatment system according to claim 1, characterized in that: The condensate outlet pipe (23) is provided with a high-pressure pump (42).

7. The above-and-below combined high-mineralization mine water treatment system according to claim 1, characterized in that: A water source heat pump compressor (43) is arranged on the first water source heat pump pipeline (30).

8. The above-and-below combined high-mineralization mine water treatment system according to claim 1, characterized in that: The preheated concentrated brine delivery pipeline (34) is provided with a crystallized salt inlet pump (44).

9. The above-and-below combined high-mineralization mine water treatment system according to claim 1, characterized in that: The crystallizer steam delivery pipeline (36) is provided with a steam compressor (45).

10. The above-and-below combined high-mineralization mine water treatment system according to claim 1, characterized in that: The crystal separator return water pipeline (39) is provided with a feed pump (46); the crystal salt concentrate pipeline (40) is provided with a discharge pump (47).

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