A solution dehumidification and regeneration system and method for a pumped storage power station

Abstract

The present invention provides a solution dehumidification and regeneration system and method for a pumped storage power station. The system includes a total heat exchanger, a moisture absorption tower, a heat exchanger, a precooler, a liquid storage tank and a regeneration tower; the cold source inlet of the total heat exchanger is connected to the low-temperature humid air pipeline of the main plant; the cold source outlet of the total heat exchanger is connected to the bottom air inlet of the moisture absorption tower through a medium-temperature humid air pipeline; the top air outlet of the moisture absorption tower is connected to the low-temperature air inlet of the heat exchanger through a low-temperature and low-humidity air pipeline, and the low-temperature dry air outlet of the heat exchanger is connected to the outside to form a passage from low-temperature humid air to low-temperature dry air. It has the advantages of: 1. Significantly reduce humidity: reduce the air humidity of the turbine layer and the volute layer of the main plant of the pumped storage power station to protect the equipment. 2. Reduce energy consumption: use waste heat to regenerate the solution, greatly reducing the energy consumption in the dehumidification process. 3. Improve efficiency: the solution dehumidification efficiency is high, and it can maintain a stable dehumidification effect at various ambient temperatures.

Description

Technical Field

[0001] The invention belongs to the technical field of dehumidification of pumped storage power stations, and in particular relates to a solution dehumidification and regeneration system and method for pumped storage power stations. Background Art

[0002] Pumped-storage power stations are developing rapidly as the main energy storage form for peak-shaving and valley-filling of power grids and new energy consumption. Pumped-storage power stations are generally built in the form of underground powerhouses. Due to the poor ventilation conditions in underground powerhouses, temperature and humidity control is particularly important. In pumped-storage power stations, since the turbines in the main powerhouse generate a lot of moisture during operation, the turbine layer and volute layer of the main powerhouse often have high humidity. The high humidity environment is prone to rust and electrical failure of equipment in the main powerhouse.

[0003] At present, the underground powerhouse of pumped storage power station often uses steam compression dehumidifier for dehumidification. Steam compression dehumidifier uses evaporator heat exchange to reduce the air temperature to below the dew point temperature for dehumidification.

[0004] The existing steam compression dehumidifier dehumidification technology has the following main defects: 1. High energy consumption: The dehumidification process requires cooling the air below the dew point, which consumes a lot of electricity. 2. Low efficiency: When the ambient temperature is low, the dehumidification efficiency drops significantly and cannot effectively remove moisture. 3. Ice on the evaporator surface: Since the plant temperature is low, generally around 14-16°C, and the heat exchange temperature difference between the refrigerant and the air on the evaporation side is generally around 8-15°C, the evaporation temperature is often below zero. At this time, the wind speed control during the dehumidification process is unreasonable, which is very easy to cause ice on the evaporator surface, reducing the contact area between the air and the evaporator, directly affecting the dehumidification effect, or even completely failing. Moreover, since the air temperature in the dehumidification environment is too low, the condensation temperature is too low, which further reduces the evaporation temperature and increases the risk of ice on the evaporator surface. 4. Complex equipment: The condensation dehumidification system needs to be equipped with complex refrigeration equipment and pipelines, which increases the installation and maintenance costs. 5. Moisture reflux: During the dehumidification process, improper discharge and treatment of condensed water may cause moisture reflux and affect the dehumidification effect. Summary of the invention

[0005] In view of the defects in the prior art, the present invention provides a solution dehumidification and regeneration system and method for a pumped storage power station, which can effectively solve the above problems.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The present invention provides a solution dehumidification and regeneration system for a pumped storage power station, comprising a total heat exchanger (1), a moisture absorption tower (2), a heat exchanger (3), a precooler (4), a liquid storage tank (5) and a regeneration tower (6);

[0008] The cold source inlet of the total heat exchanger (1) is connected to the low-temperature humid air pipeline (L1) of the main plant; the cold source outlet of the total heat exchanger (1) is connected to the bottom air inlet of the dehumidification tower (2) through the medium-temperature humid air pipeline (L2); the top air outlet of the dehumidification tower (2) is connected to the low-temperature air inlet of the heat exchanger (3) through the low-temperature and low-humidity air pipeline (L3), and the low-temperature dry air outlet (3-1) of the heat exchanger (3) is connected to the outside, forming a processing passage from low-temperature humid air to low-temperature dry air;

[0009] The bottom air inlet of the regeneration tower (6) is connected to the air compressor room of the main and auxiliary plant buildings through a high-temperature waste heat air pipeline (L4); the top air outlet of the regeneration tower (6) is connected to the heat source inlet of the total heat exchanger (1) through a high-temperature and high-humidity waste heat air pipeline (L5); the heat source outlet of the total heat exchanger (1) is connected to the medium-temperature air inlet of the heat exchanger (3) through a medium-temperature and low-humidity air pipeline (L6), and after heat exchange in the heat exchanger (3), it is discharged from the low-temperature dry air outlet (3-1) of the heat exchanger (3), forming a processing passage from high-temperature waste heat air to low-temperature dry air;

[0010] The solution outlet of the precooler (4) is connected to the top solution inlet of the moisture absorption tower (2) through a low-temperature concentrated solution pipeline (L7); the bottom solution outlet of the moisture absorption tower (2) is connected to the liquid inlet of the liquid storage tank (5) through a dilute solution pipeline (L8); the liquid discharge port of the liquid storage tank (5) is connected to the top liquid inlet of the regeneration tower (6); the bottom liquid discharge port of the regeneration tower (6) is connected to the solution inlet of the precooler (4) through a medium-temperature concentrated solution pipeline (L9), thereby forming a moisture absorption solution processing passage;

[0011] The cold water inlet of the precooler (4) is connected to the water reservoir (7) via a cold water delivery pipeline (L10); the cold water outlet of the precooler (4) is connected to the cold water inlet of the heat exchanger (3) via a low-temperature cold water pipeline (L11); the cold water outlet of the heat exchanger (3) is connected to a cold water drainage pipeline (L12) to form a cold water flow path.

[0012] Preferably, the total heat exchanger (1), the moisture absorption tower (2), the heat exchanger (3), the precooler (4), the liquid storage tank (5) and the regeneration tower (6) are arranged at the turbine layer and the volute layer of the main plant.

[0013] Preferably, a first solution pump (8) is installed in the pipeline between the liquid discharge port of the liquid storage tank (5) and the top liquid inlet of the regeneration tower (6); and a second solution pump (9) is installed in the medium-temperature concentrated solution pipeline (L9).

[0014] Preferably, a liquid replenishing valve (10) is installed on the liquid replenishing pipeline (L13) of the liquid storage tank (5).

[0015] Preferably, a water storage tank (11) is installed in the cold water delivery pipeline (L10).

[0016] Preferably, the bottom of the total heat exchanger (1) is connected to a first condensate drainage pipeline (L14); and the bottom of the heat exchanger (3) is connected to a second condensate drainage pipeline (L15).

[0017] Preferably, the dehumidification tower (2) and the regeneration tower (6) have the same structure; the dehumidification tower (2) is a conical structure, and its diameter gradually increases from bottom to top; inside the dehumidification tower (2), along the circumference of the inner wall of the dehumidification tower (2), multiple layers of spiral flow units (2-1) are arranged from bottom to top; each layer of the spiral flow units (2-1) includes multiple groups of dehumidification liquid nozzles (2-1-1) and wet air outlets (2-1-2) arranged in pairs; wherein each group of the dehumidification liquid nozzles (2-1-1) and the wet air outlets (2-1-2) are alternately arranged along the circumference of the inner wall surface (2-2) of the dehumidification tower (2);

[0018] For each pair of the desiccant liquid nozzle (2-1-1) and the wet air outlet (2-1-2), the angle between the spray direction and the tangent direction is 15°, the spray directions of the desiccant liquid nozzle (2-1-1) and the wet air outlet (2-1-2) are opposite, the desiccant liquid nozzle (2-1-1) is higher than the wet air outlet (2-1-2), and the height difference of the center line is the height of the wet air outlet (2-1-2), so that the desiccant liquid and the wet air form spiral flows in opposite directions, and the two are alternately mixed more fully.

[0019] Preferably, the air outlet velocity of the wet air outlet (2-1-2) is 0.2 to 2.5 m / s, and the diameter is 50 to 500 mm; the atomization particle size of the moisture absorbing liquid nozzle (2-1-1) is 10 to 300 μm;

[0020] The spiral flow units (2-1) are arranged in 2 to 10 layers, and the distance between adjacent layers is 0.2m to 0.8m.

[0021] The present invention also provides a method for a solution dehumidification and regeneration system for a pumped storage power station, comprising the following steps:

[0022] Step S1, preheating low temperature humid air:

[0023] The high-temperature waste heat is recovered by the total heat exchanger (1), and the high-temperature waste heat after the solution is regenerated through the regeneration tower (6) is used to preheat the low-temperature wet air before dehumidification. The specific process is as follows:

[0024] The low-temperature humid air in the main plant flows into the total heat exchanger (1) through the low-temperature humid air pipeline (L1) under the action of the fan;

[0025] The high-temperature waste heat air generated by the air compressor rooms of the main and auxiliary plants flows into the regeneration tower (6) through the high-temperature waste heat air pipeline (L4). After the regeneration solution is regenerated, the high-temperature waste heat air becomes high-temperature and high-humidity waste heat air and flows into the interior of the total heat exchanger (1);

[0026] Therefore, inside the total heat exchanger (1), the low-temperature humid air and the high-temperature and high-humidity waste heat air are heat exchanged. After the heat exchange, the low-temperature humid air becomes medium-temperature humid air and flows into the moisture absorption tower (2) through the medium-temperature and humid air pipeline (L2); after the heat exchange, the high-temperature and high-humidity waste heat air becomes medium-temperature and low-humidity air and generates condensed water, which is discharged through the first condensed water drainage pipeline (L14); the medium-temperature and low-humidity air flows into the heat exchanger (3) through the medium-temperature and low-humidity air pipeline (L6);

[0027] Step S2, medium temperature and humid air dehumidification process:

[0028] The medium-temperature humid air flowing into the hygroscopic tower (2) flows from bottom to top inside the hygroscopic tower (2); heat and mass are exchanged with the low-temperature concentrated hygroscopic liquid flowing from top to bottom inside the hygroscopic tower (2); the medium-temperature humid air is dehumidified and cooled to become low-temperature and low-humidity air, and is discharged from the top of the hygroscopic tower (2) and flows into the heat exchanger (3) through the low-temperature and low-humidity air pipeline (L3);

[0029] The low-temperature concentrated moisture absorption liquid becomes a dilute solution, is discharged from the bottom of the moisture absorption tower (2), and is discharged into the liquid storage tank (5) through the dilute solution pipeline (L8) for temporary storage;

[0030] Step S3, moisture absorbing liquid regeneration process:

[0031] After the liquid replenishment valve (10) is opened and the dilute solution is replenished into the liquid storage tank (5) through the liquid replenishment pipeline (L13), the dilute solution flows into the interior of the regeneration tower (6) from the top solution inlet of the regeneration tower (6) under the action of the first solution pump (8), and flows from top to bottom in the regeneration tower (6);

[0032] High-temperature waste hot air generated by the air compressor rooms of the main and auxiliary plant buildings flows into the interior of the regeneration tower (6) from the bottom inlet of the regeneration tower (6), and flows from bottom to top in the regeneration tower (6);

[0033] Therefore, inside the regeneration tower (6), the reversely flowing dilute solution and the high-temperature waste heat air are fully in contact to exchange heat and mass, the temperature of the dilute solution increases, the water in it evaporates, and becomes a medium-temperature concentrated solution; the high-temperature waste heat air becomes high-temperature and high-humidity waste heat air;

[0034] The high-temperature and high-humidity waste heat air flows into the total heat exchanger (1) through the high-temperature and high-humidity waste heat air pipeline (L5), and the waste heat of the high-temperature and high-humidity waste heat air is recovered and utilized through the total heat exchanger (1);

[0035] The medium-temperature concentrated solution is discharged from the bottom of the regeneration tower (6) and, under the action of the second solution pump (9), flows into the interior of the precooler (4) through the medium-temperature concentrated solution pipeline (L9) to exchange heat with the low-temperature cold water of the reservoir (7) transported through the cold water transport pipeline (L10); after the heat exchange, the medium-temperature concentrated solution becomes a low-temperature concentrated solution and flows back to the interior of the dehumidification tower (2) through the low-temperature concentrated solution pipeline (L7) to perform a dehumidification process, thereby completing the regeneration of the dehumidification liquid;

[0036] The low-temperature cold water of the reservoir is transported to the inside of the heat exchanger (3) through the low-temperature cold water pipeline (L11) after heat exchange, so as to further utilize the low-temperature cold water of the reservoir;

[0037] Step S4, using the cold water at the bottom of the reservoir as natural cooling energy to further cool and dehumidify the air:

[0038] The medium-temperature and low-humidity air flowing out of the total heat exchanger (1) and the low-temperature and low-humidity air flowing out of the moisture absorption tower (2) both flow into the air inlet of the heat exchanger (3), and the two are mixed to form mixed air, which flows inside the heat exchanger (3) and exchanges heat with the low-temperature cold water of the reservoir flowing out of the precooler (4);

[0039] After heat exchange, the mixed air becomes low-temperature dry air and produces condensed water, which is discharged through the second condensate drainage pipeline (L15); the low-temperature dry air is transported back to the main plant; the low-temperature cold water in the reservoir is discharged from the cold water drainage pipeline (L12) after heat exchange.

[0040] The solution dehumidification and regeneration system and method for a pumped storage power station provided by the present invention have the following advantages:

[0041] 1. Significantly reduce humidity: effectively reduce the air humidity in the turbine layer and volute layer of the main powerhouse of the pumped storage power station to protect the equipment.

[0042] 2. Reduce energy consumption: Use waste heat to regenerate the solution, greatly reducing energy consumption during the dehumidification process.

[0043] 3. Improve efficiency: The solution has high dehumidification efficiency and can maintain a stable dehumidification effect under various ambient temperatures.

[0044] 4. Simplified equipment: The solution dehumidification system has a simple structure and is easy to install and maintain.

[0045] 5. Environmentally friendly: No harmful gas is emitted during the solution regeneration process, which meets environmental protection requirements.

[0046] 6. Applicable to low temperature environment: Suitable for environments with temperatures of 18°C ​​or below that are not suitable for steam compression refrigeration and dehumidification.

[0047] 7. No need to discharge high humidity air: use full heat exchanger and natural cooling heat exchanger to condense water vapor in high humidity air into water and discharge it. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic structural diagram of a solution dehumidification and regeneration system for a pumped storage power station provided by the present invention.

[0049] Figure 2 A top view of the moisture absorption tower provided by the present invention;

[0050] Figure 3 This is a diagram of the installation structure of the moisture absorption tower nozzle provided by the present invention. DETAILED DESCRIPTION

[0051] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] The present invention provides a solution dehumidification and regeneration system for a pumped storage power station, which is a high-efficiency, low-energy consumption solution dehumidification and regeneration system. The system regenerates the hygroscopic solution by utilizing the waste heat of the air compressor rooms of the main and auxiliary powerhouses, so as to solve the problem of high humidity in the turbine layer and volute layer of the main powerhouse of the pumped storage power station.

[0053] See also Figure 1 The present invention provides a solution dehumidification and regeneration system for a pumped storage power station, comprising a total heat exchanger 1, a moisture absorption tower 2, a heat exchanger 3, a precooler 4, a liquid storage tank 5 and a regeneration tower 6; the total heat exchanger 1, the moisture absorption tower 2, the heat exchanger 3, the precooler 4, the liquid storage tank 5 and the regeneration tower 6 are arranged in the turbine layer and the volute layer of the main plant.

[0054] The cold source inlet of the total heat exchanger 1 is connected to the low-temperature humid air pipeline L1 of the main plant; the cold source outlet of the total heat exchanger 1 is connected to the bottom air inlet of the dehumidification tower 2 through the medium-temperature humid air pipeline L2; the top air outlet of the dehumidification tower 2 is connected to the low-temperature air inlet of the heat exchanger 3 through the low-temperature and low-humidity air pipeline L3, and the low-temperature dry air outlet 3-1 of the heat exchanger 3 is connected to the outside, forming a processing passage from low-temperature humid air to low-temperature dry air;

[0055] The bottom air inlet of the regeneration tower 6 is connected to the air compressor room of the main and auxiliary plant buildings through the high-temperature waste heat air pipeline L4; the top air outlet of the regeneration tower 6 is connected to the heat source inlet of the total heat exchanger 1 through the high-temperature and high-humidity waste heat air pipeline L5, and the heat source outlet of the total heat exchanger 1 is connected to the medium-temperature air inlet of the heat exchanger 3 through the medium-temperature and low-humidity air pipeline L6, and after heat exchange in the heat exchanger 3, it is discharged from the low-temperature dry air outlet 3-1 of the heat exchanger 3, forming a processing passage from high-temperature waste heat air to low-temperature dry air;

[0056] The solution outlet of the precooler 4 is connected to the top solution inlet of the moisture absorption tower 2 through the low-temperature concentrated solution pipeline L7; the bottom solution outlet of the moisture absorption tower 2 is connected to the liquid inlet of the liquid storage tank 5 through the dilute solution pipeline L8; the liquid discharge port of the liquid storage tank 5 is connected to the top liquid inlet of the regeneration tower 6; wherein, the first solution pump 8 is installed in the pipeline between the liquid discharge port of the liquid storage tank 5 and the top liquid inlet of the regeneration tower 6. The liquid replenishment pipeline L13 of the liquid storage tank 5 is installed with a liquid replenishment valve 10. The bottom liquid discharge port of the regeneration tower 6 is connected to the solution inlet of the precooler 4 through the medium-temperature concentrated solution pipeline L9, thereby forming a moisture absorption solution processing passage; wherein, the second solution pump 9 is installed in the medium-temperature concentrated solution pipeline L9.

[0057] The cold water inlet of the precooler 4 is connected to the reservoir 7 through the cold water delivery pipeline L10; a water storage tank 11 is installed in the cold water delivery pipeline L10. The cold water outlet of the precooler 4 is connected to the cold water inlet of the heat exchanger 3 through the low-temperature cold water pipeline L11; the cold water outlet of the heat exchanger 3 is connected to the cold water drainage pipeline L12 to form a cold water flow path.

[0058] In the present invention, the bottom of the total heat exchanger 1 is connected to the first condensate drainage pipeline L14; the bottom of the heat exchanger 3 is connected to the second condensate drainage pipeline L15; they are respectively used to discharge the generated condensate.

[0059] The present invention provides a solution dehumidification and regeneration system for the main plant of a pumped storage power station, and the main functions of each structure are:

[0060] 1. Solution dehumidification device, installed in the turbine layer and volute layer of the main powerhouse, is used to absorb moisture in the air;

[0061] The solution dehumidification device includes:

[0062] a. Desiccant tower 2: used to load desiccant solution and perform heat and mass exchange with wet air.

[0063] b. Fan: used to introduce the humid air from the turbine layer and volute layer of the main powerhouse into the moisture absorption tower 2.

[0064] 2. Solution regeneration device, used to regenerate the solution after moisture absorption by using the waste heat of the air compressor room.

[0065] The solution regeneration device includes:

[0066] a. Regeneration tower 6: used to utilize the waste heat from the air compressor room of the auxiliary plant to heat the solution and regenerate the heated solution.

[0067] 3. Total heat exchanger 1: waste heat recovery, using the waste heat after regenerating the solution to preheat the air before dehumidification.

[0068] 4. Heat exchanger 3: Use the cold water at the bottom of the reservoir as natural cooling energy to cool and dehumidify the air.

[0069] The present invention also innovates the structures of the moisture absorption tower 2 and the regeneration tower 6. The structural principles of the moisture absorption tower 2 and the regeneration tower 6 are the same. Only the moisture absorption tower 2 is taken as an example:

[0070] like Figure 2-3 As shown, the moisture absorption tower 2 is a conical structure, and its diameter gradually increases from bottom to top;

[0071] Inside the moisture absorption tower 2, multiple layers of spiral flow units 2-1 are arranged from bottom to top along the circumference of the inner wall of the moisture absorption tower 2; each layer of spiral flow units 2-1 includes multiple groups of moisture absorption liquid nozzles 2-1-1 and moist air outlets 2-1-2 arranged in pairs; therefore, one moisture absorption liquid nozzle 2-1-1 and one moist air outlet 2-1-2 form a pair of structures; wherein each group of moisture absorption liquid nozzles 2-1-1 and moist air outlets 2-1-2 are arranged horizontally along the inner wall surface 2-2 of the moisture absorption tower 2, and are arranged alternately in the circumferential direction;

[0072] For each pair of moisture absorbing liquid nozzle 2-1-1 and moist air outlet 2-1-2, the directions are arranged at an angle of 15°, that is, the angle between the spray direction and the tangent direction is 15°, the spray directions of the moisture absorbing liquid nozzle 2-1-1 and the moist air outlet 2-1-2 are opposite, the moisture absorbing liquid nozzle 2-1-1 is higher than the moist air outlet 2-1-2, and the height difference of the center line is the height of the moist air outlet 2-1-2, such as Figure 3 As shown, A is the layout position of the wet air outlet 2-1-2, and B is the layout position of the moisture absorbing liquid nozzle 2-1-1. With this structure, the moisture absorbing liquid and the wet air form spiral flows in opposite directions, and the alternating mixing of the two is more complete, so that the moisture absorption is more complete, and the atomized particles fall downward under the action of gravity and are in contact with the air for a longer time.

[0073] The specific pipeline arrangement is as follows: the wet air enters each layer of branch air pipeline along the air pipeline from the bottom of the dehumidification tower 2, and then is sprayed out from each wet air outlet 2-1-2; the dehumidification liquid enters each layer of branch solution pipeline from top to bottom from the solution pipeline at the top of the dehumidification tower 2, and then is sprayed out by the dehumidification liquid nozzle 2-1-1.

[0074] If it is a regeneration tower 6, then: high-temperature waste heat air enters each layer of branch air pipeline along the air pipeline from the bottom of the regeneration tower 6, and then is sprayed out from the wet air outlet 2-1-2; the dilute solution enters each layer of branch solution pipeline from top to bottom from the solution pipeline at the top of the regeneration tower 6, and then is sprayed out by the moisture absorbing liquid nozzle 2-1-1.

[0075] The specific process parameters can be:

[0076] The air outlet velocity of the wet air outlet 2-1-2 is 0.2-2.5 m / s, preferably in the range of 0.2-1 m / s, and the caliber is 50-500 mm;

[0077] The atomized particle size of the moisture absorbing liquid nozzle 2-1-1 is 10 to 300 μm; the preferred range is 50 to 150 μm;

[0078] The spiral flow units 2 - 1 are arranged in 2 to 10 layers, and the distance between adjacent layers is 0.2 m to 0.8 m.

[0079] The tilt angle of the dehumidification tower wall is 5-15°. The larger the air volume, the larger the angle. The smaller the air volume, the smaller the angle. The larger the opening is, the lower the air speed is, the fewer solution particles are taken away, and the solution escape is reduced.

[0080] The present invention also provides a solution dehumidification and regeneration method for a pumped storage power station, comprising the following steps:

[0081] Step S1, preheating low temperature humid air:

[0082] The high-temperature waste heat is recovered by the total heat exchanger 1, and the high-temperature waste heat after the solution is regenerated by the regeneration tower 6 is used to preheat the low-temperature wet air before dehumidification. The specific process is as follows:

[0083] The low-temperature humid air inside the main plant flows into the total heat exchanger 1 through the low-temperature humid air pipeline L1 under the action of the fan;

[0084] The high-temperature waste heat air generated by the air compressor room of the main and auxiliary plant buildings flows into the regeneration tower 6 through the high-temperature waste heat air pipeline L4. After the regeneration solution is regenerated, the high-temperature waste heat air becomes high-temperature and high-humidity waste heat air and flows into the total heat exchanger 1;

[0085] Therefore, inside the total heat exchanger 1, the low-temperature humid air and the high-temperature and high-humidity waste heat air exchange heat. After the heat exchange, the low-temperature humid air becomes medium-temperature humid air and flows into the moisture absorption tower 2 through the medium-temperature and humid air pipeline L2; the high-temperature and high-humidity waste heat air becomes medium-temperature and low-humidity air after the heat exchange, and generates condensed water, which is discharged through the first condensed water drainage pipeline L14; the medium-temperature and low-humidity air flows into the heat exchanger 3 through the medium-temperature and low-humidity air pipeline L6;

[0086] Step S2, medium temperature and humid air dehumidification process:

[0087] The medium-temperature humid air flowing into the hygroscopic tower 2 flows from bottom to top inside the hygroscopic tower 2; it exchanges heat and mass with the low-temperature concentrated hygroscopic liquid flowing from top to bottom inside the hygroscopic tower 2; the medium-temperature humid air is dehumidified and cooled to become low-temperature and low-humidity air, and is discharged from the top of the hygroscopic tower 2, and flows into the heat exchanger 3 through the low-temperature and low-humidity air pipeline L3;

[0088] The low-temperature concentrated hygroscopic liquid becomes a dilute solution, which is discharged from the bottom of the hygroscopic tower 2 and discharged into the liquid storage tank 5 through the dilute solution pipeline L8 for temporary storage;

[0089] Step S3, moisture absorbing liquid regeneration process:

[0090] After the liquid replenishing valve 10 is opened and the dilute solution is replenished to the liquid storage tank 5 through the liquid replenishing pipeline L13, the dilute solution flows into the interior of the regeneration tower 6 from the top solution inlet of the regeneration tower 6 under the action of the first solution pump 8, and flows from top to bottom in the regeneration tower 6;

[0091] The high-temperature waste hot air generated by the air compressor room of the main and auxiliary plant buildings flows into the interior of the regeneration tower 6 from the bottom inlet of the regeneration tower 6, and flows from bottom to top inside the regeneration tower 6;

[0092] Therefore, inside the regeneration tower 6, the reverse-flowing dilute solution and the high-temperature waste heat air are fully in contact to exchange heat and mass, the dilute solution temperature rises, the water in it evaporates, and becomes a medium-temperature concentrated solution; the high-temperature waste heat air becomes high-temperature and high-humidity waste heat air;

[0093] The high-temperature and high-humidity waste heat air flows into the total heat exchanger 1 through the high-temperature and high-humidity waste heat air pipeline L5, and the waste heat of the high-temperature and high-humidity waste heat air is recovered and utilized by the total heat exchanger 1;

[0094] The medium-temperature concentrated solution is discharged from the bottom of the regeneration tower 6, and under the action of the second solution pump 9, flows into the precooler 4 through the medium-temperature concentrated solution pipeline L9, and exchanges heat with the low-temperature cold water of the reservoir 7 transported through the cold water transport pipeline L10; the medium-temperature concentrated solution becomes a low-temperature concentrated solution after heat exchange, and flows back to the moisture absorption tower 2 through the low-temperature concentrated solution pipeline L7 to perform the moisture absorption process, completing the regeneration of the moisture absorption liquid;

[0095] The low-temperature cold water of the reservoir is transported to the inside of the heat exchanger 3 through the low-temperature cold water pipeline L11 after heat exchange, so as to further utilize the low-temperature cold capacity of the reservoir;

[0096] Step S4, using the cold water at the bottom of the reservoir as natural cooling energy to further cool and dehumidify the air:

[0097] The medium-temperature and low-humidity air flowing out of the total heat exchanger 1 and the low-temperature and low-humidity air flowing out of the moisture absorption tower 2 both flow into the air inlet of the heat exchanger 3, and the two are mixed to form mixed air, which flows inside the heat exchanger 3 and exchanges heat with the low-temperature cold water of the reservoir flowing out of the precooler 4;

[0098] After heat exchange, the mixed air becomes low-temperature dry air and produces condensed water, which is discharged through the second condensate drainage pipeline L15; the low-temperature dry air is transported back to the main plant; the low-temperature cold water in the reservoir is discharged from the cold water drainage pipeline L12 after heat exchange.

[0099] The solution dehumidification and regeneration system is installed in the main powerhouse of a pumped storage power station, including a solution dehumidification device and a solution regeneration device.

[0100] The solution dehumidification device is arranged at the turbine layer and the volute layer of the main powerhouse, and includes a moisture absorption tower 2 and a fan. The wet air is introduced into the moisture absorption tower 2 through the fan, and the moisture absorption tower is filled with a moisture absorption solution, which absorbs moisture in the air and dries the air.

[0101] After sufficient heat and mass exchange between the hygroscopic solution and the wet air in the hygroscopic tower 2, the hygroscopic solution becomes saturated and enters the regeneration tower 6 for regeneration; the wet air is dehumidified and then discharged into the volute layer and turbine layer of the main plant.

[0102] The saturated desiccant solution is transported to the regeneration tower 6 through a pipeline, and the high-temperature waste heat of the air compressor room is used to heat the solution to evaporate and absorb the moisture therein. After the heated concentrated solution is cooled, it is transported to the desiccant tower 2 for continued use, forming a closed loop; the high-temperature and high-humidity waste heat enters the total heat exchanger 1 to preheat the low-temperature humid air, and after heat exchange, the condensed water and medium-temperature and low-humidity air are discharged.

[0103] Through the operation of the above system, the air humidity in the main plant of the pumped-storage power station can be continuously and stably reduced, and the operating reliability and service life of the equipment can be improved.

[0104] The present invention provides a solution dehumidification and regeneration system for a pumped storage power station, the key points of which are:

[0105] 1. Solution dehumidification: Use hygroscopic solution to efficiently absorb moisture in the air and reduce air humidity.

[0106] 2. Waste heat regeneration: Use the waste heat from the air compressor rooms of the main and auxiliary plant buildings to regenerate the hygroscopic solution and improve the energy efficiency of the system.

[0107] 3. Efficient circulation: Through the circulation system of solution dehumidification and regeneration, a continuous and stable dehumidification effect is achieved.

[0108] 4. Desiccant tower spiral flow structure.

[0109] The solution dehumidification and regeneration system of the present invention can significantly reduce the humidity of the turbine layer and volute layer of the main powerhouse of the pumped storage power station, effectively preventing equipment corrosion and electrical failure. Specific effects include:

[0110] 1. Significantly reduce humidity: effectively reduce the air humidity in the turbine layer and volute layer of the main powerhouse of the pumped storage power station to protect the equipment.

[0111] 2. Reduce energy consumption: Use waste heat to regenerate the solution, greatly reducing energy consumption during the dehumidification process.

[0112] 3. Improve efficiency: The solution has high dehumidification efficiency and can maintain a stable dehumidification effect under various ambient temperatures.

[0113] 4. Simplified equipment: The solution dehumidification system has a simple structure and is easy to install and maintain.

[0114] 5. Environmentally friendly: No harmful gas is emitted during the solution regeneration process, which meets environmental protection requirements.

[0115] 6. Applicable to low temperature environment: Suitable for environments with temperatures of 18°C ​​or below that are not suitable for steam compression refrigeration and dehumidification.

[0116] 7. No need to discharge high humidity air: use full heat exchanger and natural cooling heat exchanger to condense water vapor in high humidity air into water and discharge it.

[0117] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be considered as the scope of protection of the present invention.

Claims

1. A solution dehumidification and regeneration system for a pumped storage power station, characterized in that: It includes a total heat exchanger (1), a moisture absorption tower (2), a heat exchanger (3), a precooler (4), a liquid storage tank (5) and a regeneration tower (6); The cold source inlet of the total heat exchanger (1) is connected to the low-temperature humid air pipeline (L1) of the main plant; the cold source outlet of the total heat exchanger (1) is connected to the bottom air inlet of the dehumidification tower (2) through the medium-temperature humid air pipeline (L2); the top air outlet of the dehumidification tower (2) is connected to the low-temperature air inlet of the heat exchanger (3) through the low-temperature and low-humidity air pipeline (L3), and the low-temperature dry air outlet (3-1) of the heat exchanger (3) is connected to the outside, forming a processing passage from low-temperature humid air to low-temperature dry air; The bottom air inlet of the regeneration tower (6) is connected to the air compressor room of the main and auxiliary plant buildings via a high-temperature waste heat air pipeline (L4); the top air outlet of the regeneration tower (6) is connected to the heat source inlet of the total heat exchanger (1) via a high-temperature and high-humidity waste heat air pipeline (L5); the heat source outlet of the total heat exchanger (1) is connected to the medium-temperature air inlet of the heat exchanger (3) via a medium-temperature and low-humidity air pipeline (L6); and after heat exchange in the heat exchanger (3), the heat is discharged from the low-temperature dry air outlet (3-1) of the heat exchanger (3), thereby forming a processing passage from high-temperature waste heat air to low-temperature dry air; The solution outlet of the precooler (4) is connected to the top solution inlet of the moisture absorption tower (2) via a low-temperature concentrated solution pipeline (L7); the bottom solution outlet of the moisture absorption tower (2) is connected to the liquid inlet of the liquid storage tank (5) via a dilute solution pipeline (L8); the liquid discharge port of the liquid storage tank (5) is connected to the top liquid inlet of the regeneration tower (6); the bottom liquid discharge port of the regeneration tower (6) is connected to the solution inlet of the precooler (4) via a medium-temperature concentrated solution pipeline (L9), thereby forming a moisture absorption solution processing passage; The cold water inlet of the precooler (4) is connected to the water reservoir (7) via a cold water delivery pipeline (L10); the cold water outlet of the precooler (4) is connected to the cold water inlet of the heat exchanger (3) via a low-temperature cold water pipeline (L11); the cold water outlet of the heat exchanger (3) is connected to a cold water drainage pipeline (L12) to form a cold water flow path.

2. A solution dehumidification and regeneration system for a pumped storage power station according to claim 1, characterized in that: The total heat exchanger (1), the moisture absorption tower (2), the heat exchanger (3), the precooler (4), the liquid storage tank (5) and the regeneration tower (6) are arranged at the turbine layer and the volute layer of the main plant.

3. A solution dehumidification and regeneration system for a pumped storage power station according to claim 1, characterized in that: A first solution pump (8) is installed in the pipeline between the liquid discharge port of the liquid storage tank (5) and the top liquid inlet of the regeneration tower (6); and a second solution pump (9) is installed in the medium-temperature concentrated solution pipeline (L9).

4. A solution dehumidification and regeneration system for a pumped storage power station according to claim 1, characterized in that: The liquid replenishment pipeline (L13) of the liquid storage tank (5) is equipped with a liquid replenishment valve (10).

5. A solution dehumidification and regeneration system for a pumped storage power station according to claim 1, characterized in that: A water storage tank (11) is installed in the cold water delivery pipeline (L10).

6. A solution dehumidification and regeneration system for a pumped storage power station according to claim 1, characterized in that: The bottom of the total heat exchanger (1) is connected to a first condensate drainage pipeline (L14); the bottom of the heat exchanger (3) is connected to a second condensate drainage pipeline (L15).

7. A solution dehumidification and regeneration system for a pumped storage power station according to claim 1, characterized in that: The dehumidification tower (2) and the regeneration tower (6) have the same structure; the dehumidification tower (2) is a conical structure, and its diameter gradually increases from bottom to top; inside the dehumidification tower (2), along the circumference of the inner wall of the dehumidification tower (2), multiple layers of spiral flow units (2-1) are arranged from bottom to top; each layer of the spiral flow units (2-1) includes multiple groups of dehumidification liquid nozzles (2-1-1) and wet air outlets (2-1-2) arranged in pairs; wherein each group of the dehumidification liquid nozzles (2-1-1) and the wet air outlets (2-1-2) are alternately arranged along the circumference of the inner wall surface (2-2) of the dehumidification tower (2); For each pair of the desiccant liquid nozzle (2-1-1) and the wet air outlet (2-1-2), the angle between the spray direction of the desiccant liquid nozzle (2-1-1) and the wet air outlet (2-1-2) and the tangent direction is 15°, wherein the tangent direction is: the tangent direction along the inner wall surface (2-2) of the desiccant tower (2) at the arrangement position of the desiccant liquid nozzle (2-1-1) and the wet air outlet (2-1-2); the spray directions of the desiccant liquid nozzle (2-1-1) and the wet air outlet (2-1-2) are opposite, the desiccant liquid nozzle (2-1-1) is higher than the wet air outlet (2-1-2), and the height difference between the center lines of the desiccant liquid nozzle (2-1-1) and the wet air outlet (2-1-2) is the height of the wet air outlet (2-1-2), so that the desiccant liquid and the wet air form spiral flows in opposite directions, and the two are alternately mixed more fully.

8. A solution dehumidification and regeneration system for a pumped storage power station according to claim 7, characterized in that: The air outlet velocity of the wet air outlet (2-1-2) is 0.2-2.5 m / s, and the diameter is 50-500 mm; the atomization particle size of the moisture absorbing liquid nozzle (2-1-1) is 10-300 μm; The spiral flow units (2-1) are arranged in 2 to 10 layers, and the spacing between adjacent layers is 0.2 m to 0.8 m.

9. A solution dehumidification and regeneration method for a solution dehumidification and regeneration system for a pumped storage power station using any one of claims 1 to 8, characterized in that: The bottom of the total heat exchanger (1) is connected to a first condensate drainage pipeline (L14); the bottom of the heat exchanger (3) is connected to a second condensate drainage pipeline (L15); A first solution pump (8) is installed in the pipeline between the liquid discharge port of the liquid storage tank (5) and the liquid inlet at the top of the regeneration tower (6); a second solution pump (9) is installed in the medium-temperature concentrated solution pipeline (L9); The method comprises the following steps: Step S1, preheating low temperature humid air: The high-temperature waste heat is recovered by the total heat exchanger (1), and the high-temperature waste heat after the solution is regenerated by the regeneration tower (6) is used to preheat the low-temperature wet air before dehumidification. The specific process is as follows: The low-temperature humid air in the main plant flows into the total heat exchanger (1) through the low-temperature humid air pipeline (L1) under the action of the fan; The high-temperature waste heat air generated by the air compressor rooms of the main and auxiliary plant buildings flows into the regeneration tower (6) through the high-temperature waste heat air pipeline (L4). After the regeneration solution is regenerated, the high-temperature waste heat air becomes high-temperature and high-humidity waste heat air and flows into the interior of the total heat exchanger (1); Therefore, inside the total heat exchanger (1), the low-temperature humid air and the high-temperature and high-humidity waste heat air are heat exchanged. After the heat exchange, the low-temperature humid air becomes medium-temperature humid air and flows into the dehumidification tower (2) through the medium-temperature and humid air pipeline (L2); after the heat exchange, the high-temperature and high-humidity waste heat air becomes medium-temperature and low-humidity air and generates condensed water, which is discharged through the first condensed water drainage pipeline (L14); the medium-temperature and low-humidity air flows into the heat exchanger (3) through the medium-temperature and low-humidity air pipeline (L6); Step S2, medium temperature and humid air dehumidification process: The medium-temperature humid air flowing into the hygroscopic tower (2) flows from bottom to top inside the hygroscopic tower (2); heat and mass are exchanged with the low-temperature concentrated hygroscopic liquid flowing from top to bottom inside the hygroscopic tower (2); the medium-temperature humid air is dehumidified and cooled to become low-temperature and low-humidity air, which is discharged from the top of the hygroscopic tower (2) and flows into the heat exchanger (3) through the low-temperature and low-humidity air pipeline (L3); The low-temperature concentrated desiccant liquid becomes a dilute solution, is discharged from the bottom of the desiccant tower (2), and is discharged into the liquid storage tank (5) through the dilute solution pipeline (L8) for temporary storage; Step S3, moisture absorbing liquid regeneration process: A liquid replenishing valve (10) is installed on the liquid replenishing pipeline (L13) of the liquid storage tank (5); after the liquid replenishing valve (10) is opened and the dilute solution is replenished into the liquid storage tank (5) through the liquid replenishing pipeline (L13), the dilute solution flows into the interior of the regeneration tower (6) from the top liquid inlet of the regeneration tower (6) under the action of the first solution pump (8), and flows from top to bottom in the regeneration tower (6); High-temperature waste heat air generated by the air compressor rooms of the main and auxiliary plant buildings flows into the interior of the regeneration tower (6) from the bottom air inlet of the regeneration tower (6), and flows from bottom to top inside the regeneration tower (6); Therefore, inside the regeneration tower (6), the dilute solution and the high-temperature waste heat air flowing in opposite directions are fully in contact with each other to exchange heat and mass. The temperature of the dilute solution increases, and the water therein evaporates to become a medium-temperature concentrated solution; the high-temperature waste heat air becomes high-temperature and high-humidity waste heat air. The high-temperature and high-humidity waste heat air flows into the total heat exchanger (1) through the high-temperature and high-humidity waste heat air pipeline (L5), and the waste heat of the high-temperature and high-humidity waste heat air is recovered and utilized through the total heat exchanger (1); The medium-temperature concentrated solution is discharged from the bottom of the regeneration tower (6) and, under the action of the second solution pump (9), flows into the interior of the precooler (4) through the medium-temperature concentrated solution pipeline (L9) to exchange heat with the low-temperature cold water of the reservoir (7) transported through the cold water transport pipeline (L10); after the heat exchange, the medium-temperature concentrated solution becomes a low-temperature concentrated solution and flows back to the interior of the dehumidification tower (2) through the low-temperature concentrated solution pipeline (L7) to perform a dehumidification process, thereby completing the regeneration of the dehumidification liquid; The low-temperature cold water of the reservoir is transported to the inside of the heat exchanger (3) through the low-temperature cold water pipeline (L11) after heat exchange in the precooler (4), thereby further utilizing the low-temperature cooling capacity of the reservoir; Step S4, using the cold water at the bottom of the reservoir as natural cooling energy to further cool and dehumidify the air: The medium-temperature and low-humidity air flowing out of the total heat exchanger (1) and the low-temperature and low-humidity air flowing out of the moisture absorption tower (2) both flow into the air inlet of the heat exchanger (3), and the two are mixed to form mixed air, which flows inside the heat exchanger (3) and exchanges heat with the low-temperature cold water of the reservoir flowing out of the precooler (4); After heat exchange, the mixed air becomes low-temperature dry air and produces condensed water, which is discharged through the second condensate drainage pipeline (L15); the low-temperature dry air is transported back to the main plant; the low-temperature cold water in the reservoir is discharged from the cold water drainage pipeline (L12) after heat exchange.

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