Efficient solution concentration maintaining device for energy tower

Abstract

The technical scheme of the utility model discloses an efficient solution concentration maintaining device for an energy tower. The efficient solution concentration maintaining device comprises a low-concentration solution tank, a compressor and a condensate tank, an outlet of the low-concentration solution tank is divided into two paths for connection, one path is connected to the low-concentration solution tank through the combined injection evacuator, and the other path is sequentially connected with the plate heat exchanger II, the plate heat exchanger I, a shell pass of the condenser and the high-concentration solution tank; the exhaust end of the compressor is sequentially connected with the tube pass of the condenser, the plate heat exchanger I, the tube pass of the evaporator and the suction end of the compressor; the shell side of the condenser is connected with the shell side of the evaporator through a middle liquid baffle, the shell side of the evaporator is connected with the condensate tank, and the condensate tank is connected with the plate heat exchanger II; through cooperation of the evaporator, the condenser, the plate heat exchanger I, the plate heat exchanger II, the combined evacuator and the like, low-temperature evaporation dehydration of the low-concentration secondary refrigerant is achieved, the concentration of the secondary refrigerant is improved, the system energy efficiency is high, and the cost is low.

Description

Technical Field

[0001] This utility model belongs to the field of energy tower technology, specifically relating to a high-efficiency solution concentration maintenance device for energy towers. Background Technology

[0002] When the energy tower system is operating, the refrigerant solution is gradually diluted as the energy tower runs. Specifically, the refrigerant solution in the energy tower exchanges heat with the air, cooling the air. Simultaneously, the refrigerant solution absorbs moisture from the air, causing dilution. As the refrigerant solution is diluted, its freezing point rises. Since the unit's normal operation requires the refrigerant solution's freezing point to be at least 3°C ​​lower than the evaporator's outlet water temperature, the refrigerant solution in the energy tower needs to be concentrated to maintain its concentration and ensure normal unit operation. Existing technologies for maintaining the solution concentration in energy towers typically include two methods: The first is to add a high-concentration refrigerant storage container. When a decrease in refrigerant concentration is detected, some low-concentration refrigerant is discharged, and a higher-concentration refrigerant is added to the system. This method increases the cost of refrigerant input and requires a large system footprint. The second method is to add high-temperature electric heating to the refrigerant container for high-temperature evaporation and dehydration. However, this method has low dehydration efficiency and high cost.

[0003] Patent CN 114526559 B discloses a high-efficiency dehydration maintenance system for a heat source tower, comprising three parts: a refrigerant evaporation circulation system, a refrigerant circulation system, and a refrigerant condensation circulation system. The refrigerant evaporation circulation system includes a refrigerant generator, a combined ejector evacuation device, and a refrigerant heat recovery and heat exchange circulation device. The refrigerant evaporation circulation system is connected to the refrigerant storage container in the heat source tower's water system via the refrigerant heat recovery and heat exchange circulation device. The refrigerant heat recovery and heat exchange circulation device includes a corrosion-resistant heat exchanger, inlet and outlet solenoid valves, and a concentrated solution water pump. It exchanges heat between the high-temperature refrigerant discharged from the closed system and the low-concentration refrigerant entering the closed system. The concentration is stabilized by the low-temperature evaporation of water in the refrigerant solution under negative pressure. However, in practical applications, it has been found that there is still room for improvement in energy efficiency and cost reduction. Furthermore, after the water in the refrigerant solution evaporates and forms condensate through one heat exchange, the heat energy in the condensate is not recovered and utilized. Therefore, there is a need to develop a solution concentration maintenance device for energy towers that is energy-efficient, low-cost, and space-saving. Utility Model Content

[0004] To address the existing technical problems, this utility model provides a high-efficiency solution concentration maintenance device for energy towers. By cooperating with an evaporator, condenser, plate heat exchanger I, plate heat exchanger II, and a combined evacuation device, it achieves low-temperature evaporation and dehydration of low-concentration refrigerant, thereby increasing the refrigerant concentration. The system is highly energy efficient and low in cost.

[0005] The technical solution of this utility model is: an efficient solution concentration maintenance device for energy towers, including an evaporator, a condenser, a low-concentration solution tank, a combined ejector vacuum device, a compressor, a condensate tank, a plate heat exchanger I, a plate heat exchanger II, and a high-concentration solution tank.

[0006] The outlet of the low-concentration solution tank is divided into two connections. One connection is connected back to the low-concentration solution tank through a combined ejector vacuum device, and the other connection is connected sequentially to plate heat exchanger II, plate heat exchanger I, the shell side of the condenser, and the high-concentration solution tank.

[0007] The compressor's discharge end is sequentially connected to the tube side of the condenser, plate heat exchanger I, tube side of the evaporator, and the compressor's suction end.

[0008] The shell side of the condenser is connected to the shell side of the evaporator through an intermediate baffle plate. The tube side of the evaporator is connected to the inlet of the combined ejector vacuum device. The shell side of the evaporator is connected to the condensate tank. The condensate tank is connected to plate heat exchanger II.

[0009] Furthermore, the plate heat exchanger I is used for heat exchange between the refrigerant flowing out of the low-concentration solution tank and the refrigerant flowing out of the tube side of the condenser; the plate heat exchanger II is used for heat exchange between the refrigerant flowing out of the low-concentration solution tank and the condensate flowing out of the condensate tank; the condenser is used for heat exchange between the refrigerant and the refrigerant; and the evaporator is used for heat exchange between the refrigerant and the water vapor formed after the refrigerant in the condenser absorbs heat and evaporates.

[0010] Furthermore, a solution pump I is installed between the shell side of the condenser and the high-concentration solution tank. The solution pump I is divided into two connections: one connection is connected to the high-concentration solution tank through solenoid valve I, and the other connection is connected back to the shell side of the condenser through solenoid valve II.

[0011] Furthermore, an oil separator is installed between the discharge end of the compressor and the tube side of the condenser, a drying filter and an electronic expansion valve are installed sequentially between the tube side of the plate heat exchanger I and the evaporator, and a gas-liquid separator is installed between the tube side of the evaporator and the suction end of the compressor.

[0012] Furthermore, a refrigerant pump is installed between the condensate tank and the plate heat exchanger II, and the condensate tank is connected to the refrigerant pump and the plate heat exchanger II in sequence before returning to the condensate tank.

[0013] Furthermore, the outlet of the low-concentration solution tank is connected to solution pump II.

[0014] The working process of the high-efficiency solution concentration maintenance device for energy towers of this utility model includes refrigerant circulation, refrigerant circulation and condensate circulation;

[0015] The refrigerant circulation involves a low-concentration refrigerant entering the low-concentration solution tank through the inlet, then being pressurized by solution pump II. One stream of refrigerant is evacuated back to the low-concentration solution tank via a combined evacuation device, creating a negative pressure in the space between the refrigerant in the low-concentration solution tank, plate heat exchanger II, plate heat exchanger I, and the shell side of the condenser. The other stream of refrigerant sequentially enters the shell side of plate heat exchanger II, plate heat exchanger I, and the condenser for heat exchange. The refrigerant in the shell side of the condenser absorbs heat and evaporates under low pressure to form a high-concentration refrigerant. When the refrigerant concentration has not reached the set value, solenoid valve I is closed and solenoid valve II is opened. The refrigerant is then pressurized by solution pump I and returned to the shell side of the condenser via solenoid valve II for circulation. When the refrigerant concentration reaches the set value, solenoid valve I is opened, and the high-concentration refrigerant is pressurized by solution pump I and enters the high-concentration solution tank.

[0016] The refrigerant cycle involves low-temperature, low-pressure refrigerant gas being compressed by a compressor into high-temperature, high-pressure refrigerant gas. This high-temperature, high-pressure refrigerant gas then passes through an oil separator and enters the tube side of the condenser, heating the refrigerant in the shell side. After releasing heat, the high-temperature, high-pressure refrigerant forms a gas-liquid mixture, which then enters plate heat exchanger I to heat the refrigerant. After releasing heat in plate heat exchanger I, the refrigerant passes through a dryer filter and an electronic expansion valve, becoming low-temperature, low-pressure refrigerant, which then enters the tube side of the evaporator for heat exchange. A combined evacuation device extracts non-condensable gases from the tube side of the evaporator, creating a negative pressure environment. The refrigerant absorbs heat and evaporates at low temperature in the tube side of the evaporator, becoming refrigerant gas, which then enters a gas-liquid separator. The gas-liquid separated refrigerant gas then enters the suction end of the compressor.

[0017] The condensate circulation is as follows: the refrigerant in the shell side of the condenser exchanges heat with the refrigerant in the tube side of the condenser. The refrigerant absorbs heat and evaporates at a low temperature. The evaporated water vapor enters the shell side of the evaporator through the intermediate baffle plate. The water vapor in the shell side of the evaporator exchanges heat with the refrigerant in the tube side of the evaporator. The refrigerant absorbs the heat of the water vapor and evaporates at a low temperature. The water vapor releases heat and condenses into condensate. The condensate enters the condensate tank. The condensate in the condensate tank is pressurized by the refrigerant pump and then enters the plate heat exchanger II to exchange heat with the refrigerant. After the condensate releases heat, it returns to the condensate tank.

[0018] By adopting the above technical solution, the beneficial effects achieved by this utility model are as follows:

[0019] (1) This utility model heats low-concentration refrigerant by combining evaporator, condenser, plate heat exchanger I and plate heat exchanger II. When the refrigerant concentration decreases, there is no need to add high-concentration refrigerant. The refrigerant concentration is increased by evaporation and dehydration. It occupies little space and achieves negative pressure in the system through combined vacuum device, thus achieving low-temperature evaporation, low heating temperature, high system energy efficiency, low cost, and ensuring safe and stable operation of the entire energy tower system in low-temperature environment.

[0020] (2) This utility model makes full use of the heat of the condensate formed after the refrigerant and coolant evaporate at low temperature to heat the coolant, reduce heat waste, further improve energy efficiency and reduce costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] In the diagram, 1. Evaporator; 2. Condenser; 4. Low-concentration solution tank; 5. Combined ejector vacuum device; 6. Compressor; 7. Condensate tank; 8. Plate heat exchanger I; 9. Plate heat exchanger II; 10. High-concentration solution tank; 11. Solution pump I; 12. Solenoid valve I; 13. Solenoid valve II; 14. Oil separator; 15. Dryer filter; 16. Electronic expansion valve; 17. Gas-liquid separator; 18. Refrigerant pump; 19. Solution pump II. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] Reference Figure 1 Among them, an efficient solution concentration maintenance device for an energy tower includes an evaporator 1, a condenser 2, a low-concentration solution tank 4, a combined ejector evacuation device 5, a compressor 6, a condensate tank 7, a plate heat exchanger I 8, a plate heat exchanger II 9, and a high-concentration solution tank 10.

[0026] The outlet of the low-concentration solution tank 4 is divided into two connections. One connection is connected back to the low-concentration solution tank 4 through the combined ejector vacuum device 5, and the other connection is connected sequentially to the plate heat exchanger II 9, plate heat exchanger I 8, the shell side of the condenser 2 and the high-concentration solution tank 10.

[0027] The refrigerant flowing out of the low-concentration solution tank 4 is heated three times by plate heat exchanger II 9, plate heat exchanger I 8 and condenser 2 to improve the efficiency of heat absorption and evaporation of the refrigerant.

[0028] The exhaust end of the compressor 6 is sequentially connected to the tube side of the condenser 2, the plate heat exchanger I 8, the tube side of the evaporator 1, and the suction end of the compressor 6.

[0029] The condenser 2 and plate heat exchanger I 8 fully utilize the heat of the refrigerant in the compressor 6, and the evaporator 1 recovers the heat in the system, reducing energy waste.

[0030] The shell side of condenser 2 is connected to the shell side of evaporator 1 through an intermediate baffle plate. The tube side of evaporator 1 is connected to the inlet of combined ejector vacuum device 5. The shell side of evaporator 1 is connected to condensate tank 7. Condensate tank 7 is connected to plate heat exchanger II 9.

[0031] Furthermore, the plate heat exchanger I 8 is used for heat exchange between the refrigerant flowing out of the low-concentration solution tank 4 and the refrigerant flowing out of the tube side of the condenser 2; the plate heat exchanger II 9 is used for heat exchange between the refrigerant flowing out of the low-concentration solution tank 4 and the condensate flowing out of the condensate tank 7; the condenser 2 is used for heat exchange between the refrigerant and the refrigerant; and the evaporator 1 is used for heat exchange between the refrigerant and the water vapor formed after the refrigerant in the condenser 2 absorbs heat and evaporates.

[0032] The heat of the refrigerant is absorbed and utilized a second time through plate heat exchanger I 8 and condenser 2, making full use of the heat of the refrigerant and reducing the waste of heat of the refrigerant. The heat of the water vapor formed after the refrigerant evaporates is recovered through evaporator 1, and the heat of the condensate after the water vapor is condensed is further recovered through plate heat exchanger II 9, reducing the waste of system heat and significantly improving the system energy efficiency.

[0033] Furthermore, a solution pump I 11 is provided between the shell side of the condenser 2 and the high-concentration solution tank 10. The solution pump I 11 is divided into two connections: one connection is connected to the high-concentration solution tank 10 through solenoid valve I 12, and the other connection is connected back to the shell side of the condenser 2 through solenoid valve II 13.

[0034] Condenser 2 forms an internal circulation of the refrigerant through solenoid valve II 13, which increases the circulation rate and improves the efficiency of the refrigerant's heat absorption and low-temperature evaporation.

[0035] Furthermore, an oil separator 14 is provided between the discharge end of the compressor 6 and the tube side of the condenser 2, a dryer filter 15 and an electronic expansion valve 16 are sequentially provided between the tube side of the plate heat exchanger 18 and the evaporator 1, and a gas-liquid separator 17 is provided between the tube side of the evaporator 1 and the suction end of the compressor 6.

[0036] Furthermore, a refrigerant pump 18 is installed between the condensate tank 7 and the plate heat exchanger II 9. The condensate tank 7 is connected to the refrigerant pump 18 and the plate heat exchanger II 9 in sequence and then returns to the condensate tank 7.

[0037] Furthermore, the outlet of the low-concentration solution tank 4 is connected to solution pump II 19.

[0038] The workflow of the high-efficiency solution concentration maintenance device for an energy tower in this embodiment 1 includes refrigerant circulation, refrigerant circulation, and condensate circulation;

[0039] The refrigerant circulation involves a low-concentration refrigerant entering the low-concentration solution tank 4 through the inlet, then being pressurized by solution pump II 19. One stream of refrigerant is evacuated back to the low-concentration solution tank 4 via the combined evacuation device 5, creating a negative pressure in the space between the refrigerant in the shell side of the low-concentration solution tank 4, plate heat exchanger II 9, plate heat exchanger I 8, and condenser 2. The other stream of refrigerant sequentially enters the shell side of plate heat exchanger II 9, plate heat exchanger I 8, and condenser 2 for heat exchange. The refrigerant in the shell side of condenser 2 absorbs heat and evaporates under low pressure to form a high-concentration refrigerant. When the refrigerant concentration has not reached the set value, solenoid valve I 12 closes and solenoid valve II 13 opens. The refrigerant, after being pressurized by solution pump I 11, returns to the shell side of condenser 2 via solenoid valve II 13 for circulation. When the refrigerant concentration reaches the set value, solenoid valve I 12 closes. 12 is turned on, and the high-concentration refrigerant is pressurized by solution pump I 11 and enters the high-concentration solution tank 10.

[0040] The combined ejector evacuation device 5 evacuates the refrigerant circulation space to a negative pressure, which is beneficial for the low-temperature evaporation of the refrigerant. After absorbing heat and evaporating, the refrigerant in the shell side of the condenser 2 gradually increases in concentration to reach the set concentration. During this process, in order to ensure high heat exchange efficiency, solenoid valve I 12 is closed and solenoid valve II 13 is opened during the refrigerant evaporation cycle. The refrigerant that has not reached the set concentration is pressurized by solution pump I 11 and returned to the shell side of the condenser 2 to establish an internal circulation and improve circulation efficiency.

[0041] The refrigerant circulation involves low-temperature, low-pressure refrigerant gas being compressed by compressor 6 into high-temperature, high-pressure refrigerant gas. This high-temperature, high-pressure refrigerant gas then passes through oil separator 14 and enters the tube side of condenser 2, heating the refrigerant in the shell side of condenser 2. After releasing heat, the high-temperature, high-pressure refrigerant forms a gas-liquid mixture, which then enters plate heat exchanger I 8 to heat the refrigerant. After releasing heat in plate heat exchanger I 8, the refrigerant passes through dryer filter 15 and electronic expansion valve 16 for throttling, becoming low-temperature, low-pressure refrigerant. This refrigerant then enters the tube side of evaporator 1 for heat exchange. The non-condensable gas in the tube side of evaporator 1 is extracted by combined evaporation device 5, resulting in a negative pressure state in the tube side of evaporator 1. The refrigerant absorbs heat and evaporates at low temperature in the tube side of evaporator 1, becoming refrigerant gas, which then enters gas-liquid separator 17. The gas-liquid separated refrigerant gas then enters the suction end of compressor 6.

[0042] To maintain the internal pressure during system circulation, a combined evacuation device 5 is used to extract non-condensable gases from the unit, which are then discharged into the atmosphere via a vacuum pump. The tube side of evaporator 1 is under negative pressure, which is beneficial for the low-temperature evaporation of the refrigerant in the tube side of evaporator 1.

[0043] The condensate circulation is as follows: the refrigerant in the shell side of condenser 2 exchanges heat with the refrigerant in the tube side of condenser 2, and the refrigerant absorbs heat and evaporates at low temperature. The evaporated water vapor enters the shell side of evaporator 1 through the intermediate baffle plate. The water vapor in the shell side of evaporator 1 exchanges heat with the refrigerant in the tube side of evaporator 1. The refrigerant absorbs the heat of the water vapor and evaporates at low temperature. The water vapor releases heat and condenses into condensate. The condensate enters the condensate tank 7. The condensate in the condensate tank 7 is pressurized by the refrigerant pump 18 and then enters the plate heat exchanger II 9 to exchange heat with the refrigerant. After the condensate releases heat, it returns to the condensate tank 7.

[0044] The combined ejector vacuum device 5 in this embodiment 1 is existing technology.

Claims

1. A high-efficiency solution concentration maintenance device for an energy tower, characterized by: It includes an evaporator (1), a condenser (2), a low-concentration solution tank (4), a combined ejector vacuum device (5), a compressor (6), a condensate tank (7), a plate heat exchanger I (8), a plate heat exchanger II (9), and a high-concentration solution tank (10). The outlet of the low-concentration solution tank (4) is divided into two connections. One connection is connected to the low-concentration solution tank (4) via a combined ejector vacuum device (5), and the other connection is connected to the shell side of plate heat exchanger II (9), plate heat exchanger I (8), condenser (2) and high-concentration solution tank (10) in sequence. The exhaust end of the compressor (6) is connected in sequence to the tube side of the condenser (2), the tube side of the plate heat exchanger I (8), the tube side of the evaporator (1), and the suction end of the compressor (6). The shell side of the condenser (2) is connected to the shell side of the evaporator (1) through an intermediate baffle plate. The tube side of the evaporator (1) is connected to the inlet of the combined ejector vacuum device (5). The shell side of the evaporator (1) is connected to the condensate tank (7). The condensate tank (7) is connected to the plate heat exchanger II (9).

2. The high efficiency solution concentration maintenance device for an energy tower of claim 1, wherein: The plate heat exchanger I (8) is used for heat exchange between the refrigerant flowing out of the low concentration solution tank (4) and the refrigerant flowing out of the tube side of the condenser (2); the plate heat exchanger II (9) is used for heat exchange between the refrigerant flowing out of the low concentration solution tank (4) and the condensate flowing out of the condensate tank (7); the condenser (2) is used for heat exchange between the refrigerant and the refrigerant; the evaporator (1) is used for heat exchange between the refrigerant and the water vapor formed after the refrigerant in the condenser (2) absorbs heat and evaporates.

3. The high efficiency solution concentration maintenance device for an energy tower of claim 1, wherein: A solution pump I (11) is installed between the shell side of the condenser (2) and the high-concentration solution tank (10). The solution pump I (11) is divided into two connections: one connection is connected to the high-concentration solution tank (10) through solenoid valve I (12), and the other connection is connected back to the shell side of the condenser (2) through solenoid valve II (13).

4. The high efficiency solution concentration maintenance device for an energy tower of claim 1, wherein: An oil separator (14) is provided between the exhaust end of the compressor (6) and the tube side of the condenser (2). A dryer filter (15) and an electronic expansion valve (16) are provided in sequence between the tube side of the plate heat exchanger I (8) and the evaporator (1). A gas-liquid separator (17) is provided between the tube side of the evaporator (1) and the suction end of the compressor (6).

5. The high efficiency solution concentration maintenance device for an energy tower of claim 1, wherein: A refrigerant pump (18) is installed between the condensate tank (7) and the plate heat exchanger II (9). The condensate tank (7) is connected to the refrigerant pump (18) and the plate heat exchanger II (9) in sequence and then returns to the condensate tank (7).

6. The high efficiency solution concentration maintenance device for an energy tower of claim 1, wherein: The outlet of the low-concentration solution tank (4) is connected to solution pump II (19).

7. A high efficiency solution concentration maintenance device for an energy tower according to any one of claims 1-6, characterized in that: The working process of the high-efficiency solution concentration maintenance device for the energy tower includes refrigerant circulation, refrigerant circulation, and condensate circulation. The refrigerant circulation is as follows: a low-concentration refrigerant enters the low-concentration solution tank (4) through the inlet of the low-concentration solution tank (4), and is then pressurized by solution pump II (19). One stream of refrigerant is evacuated back to the low-concentration solution tank (4) through the combined ejector evacuation device (5), creating a negative pressure in the space of the refrigerant in the shell side of the low-concentration solution tank (4), plate heat exchanger II (9), plate heat exchanger I (8), and condenser (2); another stream of refrigerant enters the plate heat exchanger II (9), plate heat exchanger I (8), and condenser (2) in sequence. Heat exchange is performed in the shell side of the condenser (2). The refrigerant in the shell side of the condenser (2) absorbs heat and evaporates under low pressure to form a high-concentration refrigerant. When the concentration of the refrigerant does not reach the set value, the solenoid valve I (12) is closed and the solenoid valve II (13) is opened. The refrigerant is pressurized by the solution pump I (11) and then returns to the shell side of the condenser (2) through the solenoid valve II (13) for circulation. When the concentration of the refrigerant reaches the set concentration value, the solenoid valve I (12) is opened and the high-concentration refrigerant is pressurized by the solution pump I (11) and enters the high-concentration solution tank (10). The refrigerant circulation is as follows: low temperature and low pressure refrigerant gas is compressed by compressor (6) and becomes high temperature and high pressure refrigerant gas. After passing through oil separator (14), the high temperature and high pressure refrigerant gas enters the tube side of condenser (2) to heat the refrigerant in shell side of condenser (2). After releasing heat, the high temperature and high pressure refrigerant forms a gas-liquid mixture and enters plate heat exchanger I (8) to heat the refrigerant. After releasing heat in plate heat exchanger I (8), the refrigerant becomes low temperature and low pressure refrigerant after passing through dryer filter (15) and electronic expansion valve (16) for throttling. It enters the tube side of evaporator (1) for heat exchange. The non-condensable gas in the tube side of evaporator (1) is extracted by combined ejector evaporation device (5) so that the tube side of evaporator (1) is in a negative pressure state. The refrigerant absorbs heat and evaporates at low temperature in the tube side of evaporator (1) and becomes refrigerant gas. It then enters gas-liquid separator (17). The gas-liquid separated refrigerant gas enters the suction end of compressor (6). The condensate circulation is as follows: the refrigerant in the shell side of the condenser (2) exchanges heat with the refrigerant in the tube side of the condenser (2), the refrigerant absorbs heat and evaporates at low temperature, and the evaporated water vapor enters the shell side of the evaporator (1) through the intermediate baffle plate. The water vapor in the shell side of the evaporator (1) exchanges heat with the refrigerant in the tube side of the evaporator (1). The refrigerant absorbs the heat of the water vapor and evaporates at low temperature. The water vapor releases heat and condenses into condensate. The condensate enters the condensate tank (7). The condensate in the condensate tank (7) is pressurized by the refrigerant pump (18) and enters the plate heat exchanger II (9) to exchange heat with the refrigerant. The condensate releases heat and then returns to the condensate tank (7).

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