Two-stage solution regeneration integrated system and method

Abstract

The invention provides a two-stage solution regeneration integrated system and method. The two-stage solution regeneration integrated system comprises an air filtering unit, an air heating unit, a primary solution spraying and atomizing unit, a solution regeneration unit and a constant-temperature heating unit. The low-concentration dehumidification solution is heated and atomized and then makes contact with filtered and heated air, and moisture is preliminarily evaporated in the main-stage dehumidification process; and carrying out secondary treatment on the substandard solution, and carrying out deep dehydration through a hollow fiber membrane module. Mine waste heat is used for constant-temperature heating, a concentration sensor and a three-way valve are used for achieving intelligent detection and automatic flow dividing control of the solution concentration, and it is ensured that the solution is stored after reaching the target concentration. On one hand, the solution concentration efficiency is remarkably improved through two-stage regeneration, and on the other hand, waste mine waste heat is fully utilized; the problems of low regeneration efficiency, high energy consumption, environmental pollution and the like of a traditional dehumidification solution are effectively solved, the method is particularly suitable for high-temperature and high-humidity environments such as deep wells and coal mines, and the operation cost and the environmental burden are greatly reduced while the dehumidification effect is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of regeneration of dehumidification solution in coal mining and utilization of mine waste heat, and specifically to a two-stage solution regeneration integrated system and method. Background Art

[0002] The mining of coal resources is a strong guarantee for energy supply and social stability. At present, my country is in a period of energy structure optimization and transformation, but coal, as a traditional advantageous energy source, still plays the role of the main energy source in the current period, and will provide supplementary and guarantee functions for new energy sources in the long transition period in the future. In the long-term mining process, shallow coal resources are gradually exhausted. As the mining depth of coal mines gradually increases, the problem of damp and stuffy working faces in underground mines becomes more and more prominent.

[0003] Mine solution dehumidification is an effective means to deal with the above problems. It uses the difference between the surface vapor pressure of the solution and the partial pressure of water vapor in the air to transfer moisture from the humid air to the solution, thereby achieving the purpose of air dehumidification. The dilute solution after dehumidification can be regenerated using low-grade energy and recycled, thereby improving the utilization rate of the solution and energy.

[0004] However, after a long period of absorbing moisture, the dehumidification solution has a lower concentration, its surface water vapor partial pressure increases, and the vapor pressure difference between it and the air decreases, resulting in a significant decrease in its dehumidification efficiency and it cannot continue to be used as a dehumidifier. If these waste liquids are not properly recycled, not only will the cost of dehumidification of the solution increase significantly, but the discharge of highly corrosive dehumidification solutions will also cause damage to the environment. Summary of the invention

[0005] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a two-stage solution regeneration integrated system and method to efficiently regenerate the dehumidification solution and achieve the dual benefits of energy saving and environmental protection.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A two-stage solution regeneration integrated system, comprising:

[0008] An air filter unit, used for filtering the air;

[0009] An air heating unit, connected to the outlet end of the air filtering unit, for heating the filtered air;

[0010] The primary solution spray atomization unit is used to spray the dehumidification solution into the air heating unit, and remove the moisture in the dehumidification solution through the heated air;

[0011] A solution regeneration unit, which is used to recover the dehumidification solution sprayed by the primary solution spraying and atomizing unit, convey the dehumidification solution that has not reached the first target concentration back to the primary solution spraying and atomizing unit, perform secondary dehumidification on the dehumidification solution that has reached the first target concentration but not the second target concentration, and collect and store the dehumidification solution that has reached the second target concentration;

[0012] A constant temperature heating unit, which is used to perform constant temperature heating on the solution regeneration unit by using the waste heat of the mine.

[0013] Preferably, the air filtration unit includes a first housing and multiple layers of filter meshes; the multiple layers of filter meshes are fixed inside the first housing.

[0014] Preferably, the air heating unit includes a second housing, a central heat exchange component, and two end heat exchange components; one end of the second housing is connected to the first housing; the central heat exchange component is fixed in the middle of the second housing; the two end heat exchange components are symmetrically arranged on the upper and lower sides of the central heat exchange component; the central heat exchange component includes a central connection plate and multiple central heat exchange thin plates; the central connection plate is fixed on the second housing; the central heat exchange thin plates are fixed on the central connection plate; multiple central heat exchange thin plates are arranged in parallel at intervals; the end heat exchange component includes an end connection plate and multiple end heat exchange thin plates; the end connection plate is fixed on the second housing; the end heat exchange thin plates are fixed on the end connection plate; multiple end heat exchange thin plates are arranged in parallel at intervals; the end heat exchange thin plates are inserted between two adjacent central heat exchange thin plates; the central heat exchange thin plates and the end heat exchange thin plates are alternately interspersed.

[0015] Preferably, the primary solution spraying and atomizing unit includes an inlet solution tank, a first water pump, a first valve, a first pressure gauge, a heater, and a spray head; the spray head is arranged inside the air heating unit; the first water pump, the first valve, and the first pressure gauge are sequentially connected between the inlet solution tank and the spray head through pipelines; the heater is arranged on the pipeline between the first pressure gauge and the spray head and is used to heat the dehumidification solution in the pipeline.

[0016] Preferably, the solution regeneration unit includes a collector, a first concentration sensor, a first three-way solenoid valve, a second water pump, a second concentration sensor, a second three-way solenoid valve, a third water pump, a hollow fiber membrane module, a second valve, and an outlet solution tank; the collector is arranged in the air heating unit and is located below the spray head; the first interface of the first three-way solenoid valve is connected to the bottom of the collector through a pipeline, the second interface is connected to the second water pump through a pipeline, and the third interface is connected to the third water pump and the first interface of the second three-way solenoid valve through a pipeline; the first concentration sensor is installed on the pipeline between the collector and the first three-way solenoid valve; the second water pump is connected to the spray head; the hollow fiber membrane module is connected between the third water pump and the second interface of the second three-way solenoid valve through a pipeline; the second valve is connected between the outlet solution tank and the third interface of the second three-way solenoid valve through a pipeline; the second concentration sensor is installed on the pipeline between the hollow fiber membrane module and the second three-way solenoid valve.

[0017] Preferably, the collector includes a cylinder body and a spiral baffle; the spiral baffle is fixed inside the cylinder body; the first interface of the first three-way solenoid valve is connected to the bottom of the cylinder body.

[0018] Preferably, the constant temperature heating unit includes a constant temperature water tank, a fourth water pump, a second pressure gauge, a third valve, and a circulation pipeline; the fourth water pump is connected to the third valve and the constant temperature water tank through a pipeline; the second pressure gauge is installed on the pipeline between the fourth water pump and the third valve; the circulation pipeline is coiled around the collector; one end of the circulation pipeline is connected to the third valve, and the other end is connected to the constant temperature water tank.

[0019] Preferably, the heat exchange rate Q of the collector is:

[0020]

[0021] In the formula: D is the flow area of the spiral surface of the spiral baffle;

[0022] R is the radius of the spiral surface of the spiral baffle;

[0023] Pr is the Prandtl number;

[0024] γ is the thermal conductivity;

[0025] A is the contact area;

[0026] θ is the temperature gradient.

[0027] Preferably, the heat exchange rate Q1 of the air heating unit:

[0028]

[0029] In the formula: γ is the thermal conductivity;

[0030] α is the heat transfer coefficient;

[0031] A1 is the cross-sectional area of the heat exchange fin (27) in the rib height direction;

[0032] θ1 is the temperature difference between the two ends of the rib tip and rib root of the heat exchange fin (27);

[0033] l is the rib height of the heat exchange fin (27);

[0034] L is the distance between the upper and lower end connection plates (26);

[0035] n is the number of heat exchange fins (27);

[0036] Pr is the Prandtl number;

[0037] U is the cross-sectional perimeter (m) of the heat exchange fin (27);

[0038] u is the air velocity (m / s);

[0039] v is the kinematic viscosity (m 2 / s);

[0040]

[0041] A working method of a two-stage solution regeneration integrated system, comprising:

[0042] S1. Primary dehumidification operation

[0043] The low-concentration dehumidification solution to be regenerated is stored in the inlet solution tank; the dehumidification solution is first preheated by a heater in the pipeline, and then sprayed from the nozzle into the air heating unit. The dehumidification solution falls into the regenerator, and the air flow that has been filtered by the air filter unit and heated by the air heating unit comes into full contact with the dehumidification solution. The moisture in the dehumidification solution is carried away by the air flow, and the humid air continues to flow backward and is discharged. The dehumidification solution flows in the direction of the bottom of the regenerator; during this period, the hot water heated by the mine waste heat in the constant temperature water tank circulates through the regenerator driven by the fourth water pump to heat the regenerator and keep it at a constant temperature;

[0044] S2. Secondary dehumidification operation

[0045] The first concentration sensor continuously detects whether the concentration of the dehumidification solution flowing out of the regenerator reaches the preset value of the first target concentration. If it does not reach the first target concentration, the dehumidification solution needs to be recycled and sprayed. The dehumidification solution is transported to the nozzle through the first three-way solenoid valve and the second water pump and is sprayed again into the regenerator;

[0046] When the first concentration sensor detects that the concentration of the dehumidification solution reaches the value of the first target concentration but does not reach the value of the second target concentration, the dehumidification solution is transported to the hollow fiber membrane module through the first three-way solenoid valve by the third water pump. The water in the dehumidification solution is separated through the hollow fiber membrane module for secondary dehumidification. When the second concentration sensor detects that the concentration of the dehumidification solution flowing out of the hollow fiber membrane module reaches the preset value of the second target concentration, at this time, the dehumidification solution meets the standard for reuse, and the dehumidification solution enters the outlet solution tank through the second three-way solenoid valve and the second valve for collection and storage. When the second concentration sensor detects that the concentration of the dehumidification solution flowing out of the hollow fiber membrane module does not reach the preset value of the second target concentration, the dehumidification solution re-enters the hollow fiber membrane module through the second three-way solenoid valve and the third water pump for secondary dehumidification;

[0047] When the first concentration sensor detects that the concentration of the dehumidification solution reaches the value of the second target concentration, the dehumidification solution directly enters the outlet solution tank through the first electromagnetic three-way valve, the second electromagnetic three-way valve, and the second valve for collection and storage.

[0048] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0049] Efficient double-stage regeneration: By combining the primary (hot air evaporation) and secondary (hollow fiber membrane separation) regeneration methods, the concentration efficiency of the dehumidification solution is significantly improved. The primary treatment uses heated air to quickly evaporate water, and the secondary treatment deeply dehydrates through membrane separation technology. The synergistic effect of the two makes the solution regeneration more thorough, solving the problem of low efficiency of traditional single regeneration methods.

[0050] Energy conservation and environmental protection: The system makes full use of the waste heat in the mine as the heat source of the constant temperature heating unit, and heats the collector at a constant temperature through the circulation pipeline, greatly reducing energy consumption. In addition, by recycling and regenerating the highly corrosive dehumidification solution, the waste liquid discharge is reduced, realizing the recycling of resources and having significant environmental benefits.

[0051] Intelligent control: The system is equipped with a concentration sensor and a three-way solenoid valve, which can monitor the solution concentration in real time and automatically adjust the solution flow direction according to the preset target. The unqualified solution automatically returns to the primary or secondary stage for further processing until the concentration meets the standard and is stored. The whole process does not require manual intervention, improving the automation level and operation efficiency of the system.

[0052] Structure optimization: The air heating unit adopts a ribbed channel design with alternating central and end heat exchange thin plates, increasing the heat exchange area and time, and improving the heating efficiency. A spiral guide plate is arranged inside the collector, extending the solution flow path and further enhancing the heat exchange effect to ensure that the solution is fully concentrated. Description of the Drawings

[0053] Figure 1 is a structural schematic diagram of the present invention;

[0054] Figure 2 is a structural schematic diagram of the regenerator in the present invention;

[0055] Figure 3 is a structural schematic diagram of the central heat exchange component and the end heat exchange component in the present invention.

[0056] Wherein:

[0057] 1. Inlet solution tank; 2. First water pump; 3. First valve; 4. First pressure gauge; 5. Heater; 6. Constant temperature heating unit; 7. Sprayer; 8. Primary solution spraying and atomizing unit; 9. Third valve; 10. Second pressure gauge; 11. Fourth water pump; 12. Constant temperature water tank; 13. Circulation pipeline; 14. Regenerator; 15. Second housing; 16. Solution regeneration unit; 17. Second valve; 18. Second three-way solenoid valve; 19. Outlet solution tank; 20. Second concentration sensor; 21. Second water pump; 22. Hollow fiber membrane module; 23. Third water pump; 24. First three-way solenoid valve; 25. First concentration sensor; 26. End connection plate; 27. End heat exchange thin sheet; 28. Air heating unit; 29. Air filtration unit; 30. First housing; 31. Multi-layer filter screen; 32. Central connection plate; 33. Central heat exchange thin sheet; 34. Cylinder body; 35. Spiral baffle plate. Detailed implementation manners

[0058] The present invention will be further described below with reference to the accompanying drawings.

[0059] As Figures 1 to 3 shown, a double-stage solution regeneration integrated system includes:

[0060] An air filtration unit 29 for filtering air;

[0061] An air heating unit 28 connected to the outlet end of the air filtration unit 29 for heating the filtered air;

[0062] A primary solution spraying and atomizing unit 8 for spraying a dehumidifying solution into the air heating unit, and the heated air takes away the moisture in the dehumidifying solution;

[0063] A solution regeneration unit 16 for recovering the dehumidifying solution sprayed by the primary solution spraying and atomizing unit 8, transporting the dehumidifying solution that does not reach the first target concentration back to the primary solution spraying and atomizing unit 8, performing secondary dehumidification on the dehumidifying solution that reaches the first target concentration but does not reach the second target concentration, and collecting and storing the dehumidifying solution that reaches the second target concentration; the values of the first target concentration and the second target concentration are preset according to actual needs;

[0064] A constant temperature heating unit 6 for constantly heating the solution regeneration unit 16 by using the waste heat of the mine.

[0065] In this embodiment, it further includes a control cabinet for controlling the operation of the system.

[0066] In this embodiment, the air filtering unit 29 includes a first housing 30 and multiple layers of filter meshes 31; the multiple layers of filter meshes 31 are fixed inside the first housing 30. The structure of the air filtering unit 29 adopts the existing conventional design for filtering impurities in the air to prevent contamination of the dehumidification solution.

[0067] In this embodiment, the air heating unit 28 includes a second housing 15, a central heat exchange component, and two end heat exchange components; one end of the second housing 15 is connected to the first housing 30; the central heat exchange component is fixed in the middle of the second housing 15; the two end heat exchange components are symmetrically arranged on the upper and lower sides of the central heat exchange component; the central heat exchange component includes a central connecting plate 32 and multiple central heat exchange thin plates 33; the central connecting plate 32 is fixed on the second housing 15; the central heat exchange thin plates 33 are fixed on the central connecting plate 32; the multiple central heat exchange thin plates 33 are arranged in parallel at intervals; the end heat exchange component includes an end connecting plate 26 and multiple end heat exchange thin plates 27; the end connecting plate 26 is fixed on the second housing 15; the end heat exchange thin plates 27 are fixed on the end connecting plate 26; the multiple end heat exchange thin plates 27 are arranged in parallel at intervals; the end heat exchange thin plates 27 are inserted between two adjacent central heat exchange thin plates 33; the central heat exchange thin plates 33 and the end heat exchange thin plates 27 are alternately interspersed, and the central heat exchange thin plates 33 and the end heat exchange thin plates 27 form a ribbed channel structure, and the air flow circulates between the ribbed channel structures to increase the heat exchange time.

[0068] In this embodiment, the primary solution spraying and atomizing unit 8 includes an inlet solution tank 1, a first water pump 2, a first valve 3, a first pressure gauge 4, a heater 5, and a nozzle 7; the nozzle 7 is arranged inside the air heating unit 28; the first water pump 2, the first valve 3, and the first pressure gauge 4 are sequentially connected by pipelines between the inlet solution tank 1 and the nozzle 7; the heater 5 is arranged on the pipeline between the first pressure gauge 4 and the nozzle 7 for heating the dehumidification solution in the pipeline to realize preheating of the dehumidification solution, so that after the dehumidification solution is sprayed out, the water is more likely to evaporate.

[0069] In this embodiment, the solution regeneration unit 16 includes a collector, a first concentration sensor 25, a first three-way solenoid valve 24, a second water pump 21, a second concentration sensor 20, a second three-way solenoid valve 18, a third water pump 23, a hollow fiber membrane module 22, a second valve 17, and an outlet solution tank 19; the collector is disposed within the air heating unit 28 and is located below the nozzle 7; a first interface of the first three-way solenoid valve 24 is connected to the bottom of the collector through a pipe, a second interface is connected to the second water pump 21 through a pipe, and a third interface is connected to the third water pump 23 and a first interface of the second three-way solenoid valve 18 through a pipe; the first concentration sensor 25 is installed on the pipe between the collector and the first three-way solenoid valve 24; the second water pump 21 is connected to the nozzle 7; the hollow fiber membrane module 22 is connected between the third water pump 23 and a second interface of the second three-way solenoid valve 18 through a pipe; the second valve 17 is connected between the outlet solution tank 19 and a third interface of the second three-way solenoid valve 18 through a pipe; the second concentration sensor 20 is installed on the pipe between the hollow fiber membrane module 22 and the second three-way solenoid valve 18. The hollow fiber membrane module 22 is an existing product, which is used to separate the moisture in the dehumidification solution. The separated moisture is collected and centrally processed, and the dehumidification solution after separation is output through the hollow fiber membrane module 22.

[0070] In this embodiment, the collector includes a cylinder body 34 and a spiral guide plate 35; the spiral guide plate 35 is fixed within the cylinder body 34; the first interface of the first three-way solenoid valve 24 is connected to the bottom of the cylinder body 34.

[0071] In this embodiment, the constant temperature heating unit 6 includes a constant temperature water tank 12, a fourth water pump 11, a second pressure gauge 10, a third valve 9, and a circulation pipe 13; the fourth water pump 11 is connected to the third valve 9 and the constant temperature water tank 12 through a pipe; the second pressure gauge 10 is installed on the pipe between the fourth water pump 11 and the third valve 9; the circulation pipe 13 is coiled around the collector; one end of the circulation pipe 13 is connected to the third valve 9, and the other end is connected to the constant temperature water tank 12. The heat source of the water in the constant temperature water tank 12 is the mine waste heat.

[0072] In this embodiment, the central heat exchange thin plate 33 and the end heat exchange thin plate 27 are electric heating sheets.

[0073] In this embodiment, the heat exchange rate Q of the collector is as follows:

[0074]

[0075] In the formula: D is the cross-sectional flow area of the spiral surface of the spiral guide plate;

[0076] R is the radius of the spiral surface of the spiral guide plate;

[0077] Pr is the Prandtl number;

[0078] γ is the thermal conductivity;

[0079] A is the contact area;

[0080] θ is the temperature gradient.

[0081] In this embodiment, the heat exchange rate Q1 of the air heating unit:

[0082]

[0083] In the formula: γ is the thermal conductivity (W / (m·K));

[0084] α is the heat transfer coefficient (W / (m 2 ·K));

[0085] A1 is the cross-sectional area of the heat exchange fin (27) in the rib height direction (m 2 );

[0086] θ1 is the temperature difference (K) between the rib tip and the rib root of the heat exchange fin (27);

[0087] l is the rib height (m) of the heat exchange fin (27);

[0088] L is the distance (m) between the upper and lower end connecting plates (26);

[0089] n is the number of heat exchange fins (27);

[0090] Pr is the Prandtl number;

[0091] U is the cross-sectional perimeter (m) of the heat exchange fin (27);

[0092] u is the air flow velocity (m / s);

[0093] v is the kinematic viscosity (m 2 / s);

[0094]

[0095] A working method of a two-stage solution regeneration integrated system includes:

[0096] S1. Primary dehumidification operation

[0097] The low-concentration dehumidification solution to be regenerated is stored in the inlet solution tank 1; the dehumidification solution is first preliminarily heated by the heater 5 in the pipeline, and then sprayed from the nozzle 7 into the air heating unit 28. The dehumidification solution falls into the regenerator 14, and the air flow that has been filtered by the air filtration unit 29 and heated by the air heating unit 28 comes into full contact with the dehumidification solution. The moisture in the dehumidification solution is carried away by the air flow, and the humid air continues to flow backward and is discharged. The dehumidification solution flows in the direction of the bottom of the regenerator 14; during this period, the hot water heated by the mine waste heat in the constant temperature water tank 12 circulates through the regenerator 14 driven by the fourth water pump 11 to heat the regenerator 14 and keep it at a constant temperature;

[0098] S2. Secondary dehumidification operation

[0099] The first concentration sensor 25 continuously detects whether the concentration of the dehumidification solution flowing out of the regenerator 14 reaches the preset value of the first target concentration. If it does not reach the first target concentration, the dehumidification solution needs to be recycled and sprayed. The dehumidification solution is conveyed to the nozzle 7 through the first three-way solenoid valve 24 and the second water pump 21 and is re-sprayed into the regenerator 14;

[0100] When the first concentration sensor 25 detects that the concentration of the dehumidification solution reaches the value of the first target concentration but does not reach the value of the second target concentration, the dehumidification solution is conveyed to the hollow fiber membrane module 22 through the first three-way solenoid valve 24 by the third water pump 23, and the moisture in the dehumidification solution is separated through the hollow fiber membrane module 22 for secondary dehumidification; when the second concentration sensor 20 detects that the concentration of the dehumidification solution flowing out of the hollow fiber membrane module 22 reaches the preset value of the second target concentration, at this time the dehumidification solution meets the standard for being reused, and the dehumidification solution enters the outlet solution tank 19 through the second three-way solenoid valve 18 and the second valve 17 for collection and storage; when the second concentration sensor 20 detects that the concentration of the dehumidification solution flowing out of the hollow fiber membrane module 22 does not reach the preset value of the second target concentration, the dehumidification solution re-enters the hollow fiber membrane module 22 through the second three-way solenoid valve 18 and the third water pump 23 for secondary dehumidification;

[0101] When the first concentration sensor 25 detects that the concentration of the dehumidification solution reaches the value of the second target concentration, the dehumidification solution directly enters the outlet solution tank 19 through the first electromagnetic three-way valve, the second electromagnetic three-way valve, and the second valve 17 for collection and storage.

[0102] Working principle

[0103] System objective:

[0104] Efficiently regenerate the coal mine dehumidification solution through double-stage regeneration (primary + secondary), and use the mine waste heat for constant temperature heating to achieve energy conservation and environmental protection.

[0105] Solve the problems of efficiency decline and waste liquid pollution caused by the reduction of the concentration of traditional dehumidification solutions.

[0106] Core process:

[0107] Primary dehumidification:

[0108] The low-concentration solution is sprayed onto the heated air after being heated, and the moisture is carried away by the hot air to preliminarily concentrate the solution.

[0109] The constant-temperature heating unit 6 (mine waste heat) maintains the temperature of the regenerator 14 to improve the moisture evaporation efficiency.

[0110] Secondary dehumidification:

[0111] The solution that does not meet the high-concentration standard is deeply dehydrated through the hollow fiber membrane module 22 and further concentrated to the target concentration.

[0112] Hierarchical control:

[0113] The concentration sensor monitors in real time and circulates to the primary or secondary level as needed until it meets the standard and is then stored.

[0114] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A two-stage integrated solution regeneration system, characterized in that, Comprising: An air filtration unit (29) for filtering air; An air heating unit (28) connected to the outlet end of the air filtration unit (29) for heating the filtered air; A primary solution spraying and atomizing unit (8) for spraying a dehumidification solution into the air heating unit (28), and the heated air taking away the moisture in the dehumidification solution; A solution regeneration unit (16) for recovering the dehumidification solution sprayed by the primary solution spraying and atomizing unit (8), conveying the dehumidification solution that has not reached the first target concentration back to the primary solution spraying and atomizing unit (8), performing secondary dehumidification on the dehumidification solution that has reached the first target concentration but not the second target concentration, and collecting and storing the dehumidification solution that has reached the second target concentration; A constant temperature heating unit (6) for performing constant temperature heating on the solution regeneration unit (16) by using the waste heat of the mine.

2. The dual-stage solution regeneration integrated system according to claim 1, wherein The air filtration unit (29) includes a first housing (30) and multiple layers of filter meshes (31); the multiple layers of filter meshes (31) are fixed inside the first housing (30).

3. A two-stage integrated solution regeneration system according to claim 2, wherein The air heating unit (28) includes a second housing (15), a central heat exchange assembly, and two end heat exchange assemblies; one end of the second housing (15) is connected to the first housing (30); the central heat exchange assembly is fixed in the middle of the second housing (15); the two end heat exchange assemblies are symmetrically arranged on the upper and lower sides of the central heat exchange assembly; the central heat exchange assembly includes a central connecting plate (32) and multiple central heat exchange thin plates (33); the central connecting plate (32) is fixed on the second housing (15); the central heat exchange thin plates (33) are fixed on the central connecting plate (32); the multiple central heat exchange thin plates (33) are arranged in parallel at intervals; the end heat exchange assembly includes an end connecting plate (26) and multiple end heat exchange thin plates (27); the end connecting plate (26) is fixed on the second housing (15); the end heat exchange thin plates (27) are fixed on the end connecting plate (26); the multiple end heat exchange thin plates (27) are arranged in parallel at intervals; the end heat exchange thin plates (27) are inserted between two adjacent central heat exchange thin plates (33); the central heat exchange thin plates (33) and the end heat exchange thin plates (27) are alternately interspersed.

4. A two-stage integrated solution regeneration system according to claim 1, characterized in that, The primary solution spraying and atomizing unit (8) includes an inlet solution tank (1), a first water pump (2), a first valve (3), a first pressure gauge (4), a heater (5), and a spray head (7); the spray head (7) is arranged inside the air heating unit (28); the first water pump (2), the first valve (3), and the first pressure gauge (4) are sequentially connected between the inlet solution tank (1) and the spray head (7) through pipes; the heater (5) is arranged on the pipe between the first pressure gauge (4) and the spray head (7) for heating the dehumidification solution in the pipe.

5. The dual-stage solution regeneration integrated system according to claim 4, characterized in that, The solution regeneration unit (16) includes a collector, a first concentration sensor (25), a first three-way solenoid valve (24), a second water pump (21), a second concentration sensor (20), a second three-way solenoid valve (18), a third water pump (23), a hollow fiber membrane module (22), a second valve (17), and an outlet solution tank (19); the collector is arranged inside the air heating unit (28) and is located below the spray head (7); the first interface of the first three-way solenoid valve (24) is connected to the bottom of the collector through a pipeline, the second interface is connected to the second water pump (21) through a pipeline, and the third interface is connected to the first interface of the third water pump (23) and the second three-way solenoid valve (18) through a pipeline; the first concentration sensor (25) is installed on the pipeline between the collector and the first three-way solenoid valve (24); the second water pump (21) is connected to the spray head (7); the hollow fiber membrane module (22) is connected between the third water pump (23) and the second interface of the second three-way solenoid valve (18) through a pipeline; the second valve (17) is connected between the outlet solution tank (19) and the third interface of the second three-way solenoid valve (18) through a pipeline; the second concentration sensor (20) is installed on the pipeline between the hollow fiber membrane module (22) and the second three-way solenoid valve (18).

6. The dual-stage solution regeneration integrated system according to claim 5, characterized in that, The collector includes a cylinder body (34) and a spiral guide plate (35); the spiral guide plate (35) is fixed inside the cylinder body (34); the first interface of the first three-way solenoid valve (24) is connected to the bottom of the cylinder body (34).

7. The dual-stage solution regeneration integrated system according to claim 5, characterized in that, The constant temperature heating unit (6) includes a constant temperature water tank (12), a fourth water pump (11), a second pressure gauge (10), a third valve (9), and a circulation pipeline (13); the fourth water pump (11) is connected to the third valve (9) and the constant temperature water tank (12) through a pipeline; the second pressure gauge (10) is installed on the pipeline between the fourth water pump (11) and the third valve (9); the circulation pipeline (13) is coiled around the collector; one end of the circulation pipeline (13) is connected to the third valve (9), and the other end is connected to the constant temperature water tank (12).

8. A two-stage integrated solution regeneration system according to claim 6, characterized in that, The heat exchange rate Q of the collector is as follows: Where: D is the cross-sectional area of the spiral surface of the spiral guide plate; R is the radius of the spiral surface of the spiral guide plate; Pr is the Prandtl number; γ is the thermal conductivity; A is the contact area; θ is the temperature gradient.

9. A two-stage integrated solution regeneration system according to claim 3, characterized in that, The heat exchange rate Q1 of the air heating unit: Where: γ is the thermal conductivity; α is the heat transfer coefficient; A1 is the cross-sectional area of the heat exchange fin (27) along the rib height direction; θ1 is the temperature difference between the rib end and the rib root of the heat exchange fin (27); l is the rib height of the heat exchange fin (27); L is the distance between the upper and lower end connection plates (26); n is the number of heat exchange fins (27); Pr is the Prandtl number; U is the cross-sectional perimeter of the heat exchange fin (27); u is the air flow velocity; v is the kinematic viscosity; m is 10. A working method of a two-stage integrated solution regeneration system, characterized in that, Including: S1, primary dehumidification operation The low-concentration dehumidification solution to be regenerated is stored in the inlet solution tank (1); the dehumidification solution is first preliminarily heated by the heater (5) in the pipeline, and then sprayed from the nozzle (7) into the air heating unit (28). The dehumidification solution falls into the regenerator (14), and the air flow that has been filtered by the air filtration unit (29) and heated by the air heating unit (28) comes into full contact with the dehumidification solution. The moisture in the dehumidification solution is carried away by the air flow, and the humid air continues to flow backward and is discharged. The dehumidification solution flows in the direction of the bottom of the regenerator (14); during this period, the hot water heated by the mine waste heat in the constant temperature water tank (12) circulates through the regenerator (14) driven by the fourth water pump (11) to heat the regenerator (14) and keep it at a constant temperature; S2. Secondary dehumidification operation The first concentration sensor (25) continuously detects whether the concentration of the dehumidification solution flowing out of the regenerator (14) reaches the value of the preset first target concentration. If it does not reach the first target concentration, the dehumidification solution needs to be recycled and sprayed. The dehumidification solution is transported to the nozzle (7) through the first three-way solenoid valve (24) and the second water pump (21) and is re-sprayed into the regenerator (14); When the first concentration sensor (25) detects that the concentration of the dehumidification solution reaches the value of the first target concentration but does not reach the value of the second target concentration, the dehumidification solution is transported to the hollow fiber membrane module (22) through the first three-way solenoid valve (24) and the third water pump (23). The moisture in the dehumidification solution is separated by the hollow fiber membrane module (22) for secondary dehumidification; when the second concentration sensor (20) detects that the concentration of the dehumidification solution flowing out of the hollow fiber membrane module (22) reaches the value of the preset second target concentration, at this time the dehumidification solution meets the standard for reuse, and the dehumidification solution enters the outlet solution tank (19) through the second three-way solenoid valve (18) and the second valve (17) for collection and storage; when the second concentration sensor (20) detects that the concentration of the dehumidification solution flowing out of the hollow fiber membrane module (22) does not reach the value of the preset second target concentration, the dehumidification solution re-enters the hollow fiber membrane module (22) through the second three-way solenoid valve (18) and the third water pump (23) for secondary dehumidification; When the first concentration sensor (25) detects that the concentration of the dehumidification solution reaches the value of the second target concentration, the dehumidification solution directly enters the outlet solution tank (19) through the first electromagnetic three-way valve, the second electromagnetic three-way valve and the second valve (17) for collection and storage.

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