Solution concentration maintaining and adding device for heat source tower

Abstract

The technical scheme of the utility model discloses a heat source tower solution concentration maintaining and adding device which comprises a refrigeration compressor, a coil pipe type evaporation heat exchanger, an air cooler, a condenser and a gas-liquid separator which are sequentially connected, and a hot gas bypass electromagnetic valve is arranged between an inlet of the refrigeration compressor and an inlet of the condenser. The coil pipe type evaporation heat exchanger is arranged in the vacuum evaporation tank, and an outlet of the solution tank is sequentially connected with the liquid supplementing electromagnetic valve, the heat recovery plate type heat exchanger and a liquid inlet of the vacuum evaporation tank; a steam outlet of the vacuum evaporation tank is sequentially connected with a condenser and a purified water tank; an air outlet of the vacuum evaporation tank is connected with the purification water tank, the purification water tank is connected with a gas inlet of the vacuum ejector, and a liquid inlet and a mixed liquid outlet of the vacuum ejector are connected with the circulating water tank; an evaporation coil I is arranged in the circulating water tank, and an evaporation coil II is arranged in the purification water tank, so that the integration of low-temperature evaporation of the solution, system liquid supplement and solution recovery is realized, the solution purification efficiency is high, and the energy consumption is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat source towers, and particularly relates to a device for maintaining and adding the concentration of the solution in a heat source tower. Background Art

[0002] When the heat source tower system is used for heating in winter, the solution (usually antifreeze) in the heat source tower exchanges heat with air to raise the temperature of the air. In this process, the solution in the heat source tower is diluted due to absorbing moisture in the air, resulting in an increase in the freezing point of the solution. However, the freezing point of the solution needs to be more than 3°C lower than the outlet water temperature of the unit evaporator to ensure the normal operation of the unit. Therefore, it is necessary to increase the concentration of the solution in the heat source tower. The existing heat source tower systems usually adopt the forms of MVR and electric heating to purify and concentrate the diluted solution in the heat source tower. However, this method causes serious fouling of the solution, reduces the working efficiency of the heat source tower system, and has high energy consumption. Currently, there is also a method of recovering the heat during the operation of the heat source tower to purify and concentrate the diluted solution, but there are still problems of low efficiency and low purification efficiency.

[0003] Patent CN103438614 B discloses a solution regeneration device based on vacuum boiling and realizing controllable condensation, including a refrigerant circuit, a solution circuit, a vacuum maintenance circuit and an air circuit. In the solution circuit, the low-concentration solution to be regenerated enters the solution regeneration device from the regenerated solution inlet end, and then enters the heat recovery device from the first input end of the heat recovery device. In the heat recovery device, it exchanges heat with the high-concentration solution coming out of the solution boiling regenerator. After the solution temperature rises, it flows out from the first output end of the heat recovery device and enters the solution boiling regenerator; the solution is heated by the refrigerant in the finned coil in the solution boiling regenerator, the solution boils, the water in the solution evaporates, and after the solution concentration rises, it flows out of the solution boiling regenerator and enters the solution pump, is pressurized and then enters the heat recovery device, exchanges heat with the low-concentration solution coming in from the inlet end of the solution regeneration device, the temperature drops, and it flows out from the second output end of the heat recovery device, and flows out of the solution regeneration device from the regenerated solution outlet end through the third solenoid valve; it makes full use of the characteristic that the boiling point of the solution decreases under vacuum for solution regeneration. However, the low-concentration solution needs to exchange heat with the high-concentration solution and the refrigerant, the solution circulation is complex, and in addition to the heating operation of the refrigeration system, a part of the condensation heat and evaporation cooling capacity is separated to provide the regeneration heat source and condensation cooling capacity for the solution regeneration, which affects the operation efficiency of the overall system, and it is impossible to supplement the solution when the solution volume is small. Therefore, it is necessary to design a device for maintaining and adding the concentration of the solution in a heat source tower that can efficiently purify and concentrate the solution in the heat source tower, has low energy consumption, and has a simple structure. Summary of the Utility Model

[0004] In order to solve the existing technical problems, the utility model provides a device for maintaining and adding the concentration of the solution in a heat source tower, which includes the mutual cooperation of a refrigeration compressor, a vacuum evaporation tank, a purified water tank, a circulating water tank, a solution tank, etc., to realize the integration of low-temperature evaporation of the solution, system liquid supplement and solution recovery, with high solution purification efficiency and low energy consumption.

[0005] The technical solution of the utility model is: a device for maintaining and adding the concentration of the solution in a heat source tower, which includes a refrigeration compressor, a coil-type evaporation heat exchanger, an air cooler, a condenser and a gas-liquid separator connected in sequence. The outlet of the gas-liquid separator is connected to the inlet of the refrigeration compressor. A refrigeration solenoid valve is arranged between the air cooler and the condenser, and a hot gas bypass solenoid valve is arranged between the inlet of the refrigeration compressor and the inlet of the condenser;

[0006] The coil-type evaporation heat exchanger is arranged in the vacuum evaporation tank. The vacuum evaporation tank is connected to the solution tank. The outlet of the solution tank is connected to the liquid inlet of the vacuum evaporation tank through a liquid supplement solenoid valve, a heat recovery plate heat exchanger in sequence. The liquid outlet of the vacuum evaporation tank is connected to the inlet of the solution tank through a concentrated solution discharge solenoid valve, a circulating liquid supplement pump, a heat recovery plate heat exchanger in sequence; A concentration sensor is arranged in the vacuum evaporation tank. The steam outlet of the vacuum evaporation tank is connected to the purified water tank through a condenser in sequence;

[0007] The air outlet of the vacuum evaporation tank is connected to the purified water tank. The purified water tank is connected to the gas inlet of the vacuum ejector. The liquid inlet and the mixed liquid outlet of the vacuum ejector are connected to the circulating water tank. A vacuum pump is arranged between the liquid inlet of the vacuum ejector and the circulating water tank;

[0008] An evaporation coil I is arranged in the circulating water tank. An evaporation coil II is arranged in the purified water tank. One end of the evaporation coil I is connected to the inlet of the gas-liquid separator. The other end of the evaporation coil I is divided into two paths. One path is connected to one end of the evaporation coil II. The other end of the evaporation coil II is connected to the inlet of the gas-liquid separator. The other path is connected to the inlet of the condenser.

[0009] Further, the liquid outlet of the vacuum evaporation tank is also connected to the heat source tower air-conditioning solution pipeline. The liquid outlet of the vacuum evaporation tank is connected to the heat source tower air-conditioning solution pipeline through a solution circulation solenoid valve II, a circulating liquid supplement pump, a solution outlet solenoid valve in sequence.

[0010] Further, a solution circulation solenoid valve I is arranged between the circulating liquid supplement pump and the heat recovery plate heat exchanger.

[0011] Further, a vacuum pumping solenoid valve is arranged between the purified water tank and the gas inlet of the vacuum ejector.

[0012] Further, a heat recovery solenoid valve I is arranged between the evaporation coil I and the condenser. A heat recovery solenoid valve II is arranged between the end of the heat recovery solenoid valve I far away from the circulating water tank and the evaporation coil II.

[0013] Furthermore, the outlet of the purified water tank is connected to a drainage pump.

[0014] Furthermore, the purified water tank is connected to the circulating water tank via a vacuum pump circulating water solenoid valve.

[0015] Furthermore, the vacuum evaporation tank, the purified water tank and the circulating water tank are equipped with liquid level gauges, and the vacuum evaporation tank is equipped with a temperature sensor.

[0016] Furthermore, the outlet of the air cooler is sequentially connected to a liquid reservoir, a ball valve, a filter and a refrigeration solenoid valve.

[0017] By adopting the above technical solution, the beneficial effects achieved by the utility model are as follows:

[0018] (1) The utility model realizes the integration of low-temperature evaporation of solution, system refilling and solution recovery through the mutual cooperation of refrigeration compressor, vacuum evaporation tank, purification water tank, circulating water tank and solution tank, and maintains the working efficiency of the entire heat source tower system during the low-temperature evaporation of solution for purification through the hot gas bypass solenoid valve, so that the solution purification efficiency is high and the energy consumption is low.

[0019] (2) The concentrated solution after purification in the vacuum evaporation tank transfers heat through the heat recovery plate heat exchanger to the dilute solution that enters the heat recovery plate heat exchanger from the solution tank through the liquid replenishment solenoid valve. The dilute solution enters the vacuum evaporation tank after preliminary temperature increase in the heat recovery plate heat exchanger, which not only recovers the heat of the discharged concentrated solution, but also increases the temperature of the solution entering the vacuum evaporation tank, thereby reducing the energy consumption of the compressor and improving the efficiency of low-temperature evaporation.

[0020] (3) The water vapor after low-temperature evaporation of the solution in the vacuum evaporator is condensed through the condenser, and the condensed distilled water is transported to the purification tank. The distilled water in the purification tank not only recovers heat through the evaporation coil II, but also provides distilled water for the circulating water tank to supply the vacuum ejector and further recover heat through the evaporation coil I. The heat recovery is sufficient and the normal operation of the system vacuum pumping is guaranteed.

[0021] (4) A circulating replenishment pump is used to recover the concentrated solution and replenish the system. The structure is simple and reasonable, which is beneficial to the small overall space occupied by the heat source tower system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] In the figure, 1 is a refrigeration compressor; 2 is a coil-type evaporation heat exchanger; 3 is an air cooler; 4 is a condenser; 5 is a gas-liquid separator; 6 is a refrigeration solenoid valve; 7 is a hot gas bypass solenoid valve; 8 is a vacuum evaporation tank; 9 is a solution tank; 10 is a replenishing solenoid valve; 11 is a heat recovery plate heat exchanger; 12 is a circulating replenishing pump; 14 is a purified water tank; 15 is a circulating water tank; 16 is a vacuum ejector; 17 is an evaporation coil I; 18 is an evaporation coil II;

[0024] 19 is a solution circulation solenoid valve II; 21 is a solution outlet solenoid valve; 22 is a solution circulation solenoid valve I; 23 is a vacuum pumping solenoid valve; 24 is a heat recovery solenoid valve I; 25 is a heat recovery solenoid valve II; 26 is a drain pump; 27 is a level gauge; 28 is a vacuum pump circulating water solenoid valve; 29 is a liquid receiver; 30 is a ball valve; 31 is a filter; 32 is a concentrated solution discharge solenoid valve; 33 is a vacuum pump; 34 is a temperature sensor. Specific embodiments

[0025] The present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Embodiment 1

[0027] Referring to Figure 1 In [a certain reference], a device for maintaining and adding the solution concentration of a heat source tower includes a refrigeration compressor 1, a coil-type evaporation heat exchanger 2, an air cooler 3, a condenser 4, and a gas-liquid separator 5 that are connected in sequence. The outlet of the gas-liquid separator 5 is connected to the inlet of the refrigeration compressor 1. A refrigeration solenoid valve 6 is provided between the air cooler 3 and the condenser 4, and a hot gas bypass solenoid valve 7 is provided between the inlet of the refrigeration compressor 1 and the inlet of the condenser 4. The circulation of the refrigerant and the refrigeration and heating processes of the heat source tower are realized through the cooperation of the refrigeration compressor 1, etc. When the heat source tower system is evacuated, the refrigeration compressor 1 maintains a relatively high power through the hot gas bypass solenoid valve 7. The refrigerant in the coil-type evaporation heat exchanger 2 exchanges heat with the solution in the vacuum evaporation tank 8. However, as the operation time of the heat source tower system increases, the heat exchange efficiency decreases, and the heat exchange efficiency of the system is maintained through the air cooler 3.

[0028] The coiled tube type evaporation heat exchanger 2 is arranged in the vacuum evaporation tank 8. The vacuum evaporation tank 8 is connected to the solution tank 9. The outlet of the solution tank 9 is successively connected to the replenishing liquid solenoid valve 10, the heat recovery plate heat exchanger 11, and the liquid inlet of the vacuum evaporation tank 8. The liquid outlet of the vacuum evaporation tank 8 is successively connected to the concentrated solution discharge solenoid valve 32, the circulating replenishing liquid pump 12, the heat recovery plate heat exchanger 11, and the inlet of the solution tank 9; a concentration sensor is arranged in the vacuum evaporation tank 8. The steam outlet of the vacuum evaporation tank 8 is successively connected to the condenser 4 and the purified water tank 14; through the cooperation of the coiled tube type evaporation heat exchanger 2, the solution tank 9, the replenishing liquid solenoid valve 10, the circulating replenishing liquid pump 12, etc., when the amount of solution in the vacuum evaporation tank 8 is insufficient, replenishing liquid is carried out, and when the amount of solution in the vacuum evaporation tank 8 is excessive and the concentration is high, the concentrated solution is discharged from the vacuum evaporation tank 8, and the heat in the concentrated solution is recovered through the heat recovery plate heat exchanger 11 to make full use of the heat.

[0029] The air outlet of the vacuum evaporation tank 8 is connected to the purified water tank 14. The purified water tank 14 is connected to the gas inlet of the vacuum ejector 16. The liquid inlet and the mixed liquid outlet of the vacuum ejector 16 are connected to the circulating water tank 15. A vacuum pump 33 is arranged between the liquid inlet of the vacuum ejector 16 and the circulating water tank 15; the vacuum evaporation tank 8 and the purified water tank 14 are evacuated through the vacuum ejector 16 to facilitate the low-temperature evaporation, purification and concentration of the solution in the vacuum evaporation tank 8. Through the cooperation of the circulating water tank 15 and the vacuum pump 33, the normal operation of the vacuum ejector 16 is realized.

[0030] An evaporation coil I 17 is arranged in the circulating water tank 15, and an evaporation coil II 18 is arranged in the purified water tank 14. One end of the evaporation coil I 17 is connected to the inlet of the gas-liquid separator 5. The other end of the evaporation coil I 17 is divided into two paths. One path is connected to one end of the evaporation coil II 18, the other end of the evaporation coil II 18 is connected to the inlet of the gas-liquid separator 5, and the other path is connected to the inlet of the condenser 4. The heat of the gas-liquid mixture ejected during the operation of the vacuum ejector 16 is recovered through the refrigerant in the evaporation coil I 17. The water vapor generated after the low-temperature evaporation of the solution in the vacuum evaporation tank 8 enters the purified water tank 14 to exchange heat with the refrigerant in the evaporation coil II 18 to recover the heat of the water vapor and make full use of the heat of the system.

[0031] Further, the liquid outlet of the vacuum evaporation tank 8 is also connected to the heat source tower air-conditioning solution pipeline. The liquid outlet of the vacuum evaporation tank 8 is successively connected to the solution circulation solenoid valve II 19, the circulation make-up pump 12, the solution outlet solenoid valve 21, and the heat source tower air-conditioning solution pipeline. The solution in the vacuum evaporation tank 8 is successively transported to the heat source tower air-conditioning solution pipeline through the solution circulation solenoid valve II 19, the circulation make-up pump 12, and the solution outlet solenoid valve 21. And through one circulation make-up pump 12, the discharge of the concentrated solution in the vacuum evaporation tank 8 and the make-up of the heat source tower air-conditioning solution pipeline are realized, with a simple structure and high efficiency.

[0032] Further, a solution circulation solenoid valve I 22 is arranged between the circulation make-up pump 12 and the heat recovery plate heat exchanger 11. The solution circulation solenoid valve I 22 controls the circulation make-up pump 12 to transport the solution to the heat recovery plate heat exchanger 11.

[0033] Further, a vacuum solenoid valve 23 is arranged between the purified water tank 14 and the gas inlet of the vacuum ejector 16. The operation of the vacuum ejector 16 is controlled by the vacuum solenoid valve 23 and the vacuum pump 33.

[0034] Further, a heat recovery solenoid valve I 24 is arranged between the evaporation coil I 17 and the condenser 4, and a heat recovery solenoid valve II 25 is arranged between the end of the heat recovery solenoid valve I 24 far from the circulation water tank 15 and the evaporation coil II 18. The heat exchange of the refrigerant and the solution in the evaporation coil I 17 and the evaporation coil II 18 is controlled by the heat recovery solenoid valve I 24 and the heat recovery solenoid valve II 25, and the heat recovery process is controlled.

[0035] Further, the outlet of the purified water tank 14 is connected to a drain pump 26. When the liquid level in the purified water tank 14 reaches the high liquid level, the water in the purified water tank 14 is discharged through the drain pump 26 to avoid failures.

[0036] Further, the purified water tank 14 is connected to the circulation water tank 15 through a vacuum pump circulating water solenoid valve 28. When the liquid level in the circulation water tank 15 is lower than the set low liquid level, the vacuum pump circulating water solenoid valve 28 is opened to transport the distilled water in the purified water tank 14 to the circulation water tank 15 to ensure the normal operation of the vacuum ejector 16.

[0037] Further, a liquid level gauge 27 is installed on the vacuum evaporation tank 8, the purified water tank 14, and the circulation water tank 15, and a temperature sensor 34 is installed in the vacuum evaporation tank 8. The liquid levels in the vacuum evaporation tank 8, the purified water tank 14, and the circulation water tank 15 are monitored through the liquid level gauge 27, and the temperature of the solution in the vacuum evaporation tank 8 is detected through the temperature sensor 34, which is convenient for adjusting the system in a timely manner.

[0038] Further, the outlet of the air cooler 3 is sequentially connected to a liquid storage tank 29, a ball valve 30, a filter 31, and a refrigeration solenoid valve 6. The normal operation of the air cooler 3 and the normal circulation of the refrigerant are maintained by the liquid storage tank 29, the ball valve 30, and the filter 31.

[0039] The working principle of a heat source tower solution concentration maintenance and addition device of the present utility model is as follows: When purifying the solution, first open the vacuum solenoid valve 23, and the vacuum pump 33 starts to work to pump the vacuum degree of the vacuum evaporation tank 8 to below 15 kPa; then open the liquid supplement solenoid valve 10 to convey the solution in the solution tank 9 to the vacuum evaporation tank 8. When the liquid level in the vacuum evaporation tank 8 reaches the high liquid level, close the liquid supplement solenoid valve 10; at this time, detect the vacuum degree in the vacuum evaporation tank 8 to ensure that the vacuum degree in the vacuum evaporation tank 8 is lower than 5 kPa; then start the refrigeration compressor 1, and at the same time open the hot gas bypass solenoid valve 7 and the refrigeration solenoid valve 6. The refrigerant enters the coil type evaporation heat exchanger 2 to exchange heat with the solution in the vacuum evaporation tank 8, and the solution temperature rises to achieve low-temperature evaporation of the solution; when it is detected that the solution temperature in the vacuum evaporation tank 8 is higher than 40 °C, close the hot gas bypass solenoid valve 7 and continue the low-temperature evaporation of the solution; the water vapor generated by the low-temperature evaporation of the solution in the vacuum evaporation tank 8 is condensed by the condenser 4 and then enters the purified water tank 14 and exchanges heat with the refrigerant in the evaporation coil II 18. When the condensed distilled water in the purified water tank 14 reaches the set high liquid level, open the drain pump 26 to drain the distilled water in the purified water tank 14. When the distilled water in the purified water tank 14 reaches the set low liquid level, close the drain pump 26; when the liquid level of the solution in the vacuum evaporation tank 8 is lower than the set low liquid level, open the liquid supplement solenoid valve 10 to convey the solution in the solution tank 9 to the vacuum evaporation tank 8; when the concentration sensor detects that the solution concentration in the vacuum evaporation tank 8 reaches the set high concentration (the high concentration value in this embodiment 1 is 25%), turn off the refrigeration compressor 1, open the concentrated solution discharge solenoid valve 32 and the solution circulation solenoid valve I 22, and start the circulating liquid supplement pump 12. The concentrated solution in the vacuum evaporation tank 8 enters the heat recovery plate heat exchanger 11 for cooling and is finally conveyed to the solution tank 9. When the concentration sensor detects that the solution concentration in the vacuum evaporation tank 8 is lower than the set low concentration (the low concentration value in this embodiment 1 is 15%), start the solution purification to maintain the concentration of the solution in the heat source tower system.

[0040] When replenishing the liquid in the heat source tower system, when the liquid levels in the vacuum evaporation tank 8 and the heat source tower air-conditioning solution pipeline are lower than the set minimum liquid level and replenishment is required, open the replenishment solenoid valve 10, the solution outlet solenoid valve 21, and the solution circulation solenoid valve II 19, close the solution circulation solenoid valve I 22, and start the circulating replenishment pump 12. The solution in the solution tank 9 absorbs heat in the heat recovery plate heat exchanger 11 and then is transported to the vacuum evaporation tank 8 for liquid replenishment; the purified concentrated solution in the vacuum evaporation tank 8 successively passes through the solution circulation solenoid valve II 19, the circulating replenishment pump 12, and the solution outlet solenoid valve 21, and enters the heat source tower air-conditioning solution pipeline for liquid replenishment. When the liquid levels in the vacuum evaporation tank 8 and the heat source tower air-conditioning solution pipeline reach the set maximum liquid level, turn off the circulating replenishment pump 12, close the replenishment solenoid valve 10, the solution outlet solenoid valve 21, and the solution circulation solenoid valve II 19, and complete the liquid replenishment of the heat source tower system.

Claims

1. A heat source tower solution concentration maintenance and addition device, characterized in that: The invention comprises a refrigeration compressor (1), a coil-type evaporative heat exchanger (2), an air cooler (3), a condenser (4) and a gas-liquid separator (5) which are connected in sequence, wherein the outlet of the gas-liquid separator (5) is connected to the inlet of the refrigeration compressor (1), a refrigeration solenoid valve (6) is arranged between the air cooler (3) and the condenser (4), and a hot gas bypass solenoid valve (7) is arranged between the inlet of the refrigeration compressor (1) and the inlet of the condenser (4); The coil-type evaporative heat exchanger (2) is arranged in a vacuum evaporation tank (8), the vacuum evaporation tank (8) and the solution tank (9) are connected, the outlet of the solution tank (9) is sequentially connected to a liquid replenishment solenoid valve (10), a heat recovery plate heat exchanger (11) and a liquid inlet of the vacuum evaporation tank (8), and the liquid outlet of the vacuum evaporation tank (8) is sequentially connected to a concentrated solution discharge solenoid valve (32), a circulating liquid replenishment pump (12), a heat recovery plate heat exchanger (11) and an inlet of the solution tank (9); a concentration sensor is arranged in the vacuum evaporation tank (8), and the steam outlet of the vacuum evaporation tank (8) is sequentially connected to a condenser (4) and a purified water tank (14); The air outlet of the vacuum evaporator (8) is connected to the purified water tank (14), the purified water tank (14) is connected to the gas inlet of the vacuum ejector (16), the liquid inlet and the mixed liquid outlet of the vacuum ejector (16) are connected to the circulating water tank (15), and a vacuum pump (33) is arranged between the liquid inlet of the vacuum ejector (16) and the circulating water tank (15); An evaporation coil I (17) is arranged in the circulation water tank (15), and an evaporation coil II (18) is arranged in the purification water tank (14). One end of the evaporation coil I (17) is connected to the inlet of the gas-liquid separator (5), and the other end of the evaporation coil I (17) is divided into two paths, one of which is connected to one end of the evaporation coil II (18), the other end of the evaporation coil II (18) is connected to the inlet of the gas-liquid separator (5), and the other is connected to the inlet of the condenser (4).

2. A heat source tower solution concentration maintaining and adding device according to claim 1, characterized in that: The liquid outlet of the vacuum evaporation tank (8) is also connected to the air conditioning solution pipeline of the heat source tower, and the liquid outlet of the vacuum evaporation tank (8) is sequentially connected to the solution circulation solenoid valve II (19), the circulation liquid replenishing pump (12), the solution liquid outlet solenoid valve (21) and the air conditioning solution pipeline of the heat source tower.

3. A heat source tower solution concentration maintaining and adding device according to claim 1 or 2, characterized in that: A solution circulation solenoid valve I (22) is provided between the circulation liquid replenishing pump (12) and the heat recovery plate heat exchanger (11).

4. A heat source tower solution concentration maintaining and adding device according to claim 1, characterized in that: A vacuum solenoid valve (23) is provided between the purified water tank (14) and the gas inlet of the vacuum ejector (16).

5. A heat source tower solution concentration maintaining and adding device according to claim 1, characterized in that: A heat recovery solenoid valve I (24) is arranged between the evaporating coil I (17) and the condenser (4), and a heat recovery solenoid valve II (25) is arranged between an end of the heat recovery solenoid valve I (24) away from the circulating water tank (15) and the evaporating coil II (18).

6. A heat source tower solution concentration maintaining and adding device according to claim 1 or 4, characterized in that: The outlet of the purified water tank (14) is connected to a drainage pump (26).

7. A heat source tower solution concentration maintaining and adding device according to claim 1, characterized in that: The purified water tank (14) is connected to the circulating water tank (15) via a vacuum pump circulating water solenoid valve (28).

8. A heat source tower solution concentration maintaining and adding device according to claim 1, characterized in that: The vacuum evaporation tank (8), the purified water tank (14) and the circulating water tank (15) are equipped with liquid level meters (27), and a temperature sensor (34) is installed in the vacuum evaporation tank (8).

9. A heat source tower solution concentration maintaining and adding device according to claim 1, characterized in that: The outlet of the air cooler (3) is sequentially connected to a liquid storage device (29), a ball valve (30), a filter (31) and a refrigeration solenoid valve (6).

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