A lithium bromide absorption unit of combined supply of steam and cold

Abstract

This invention discloses a combined steam and refrigeration lithium bromide absorption chiller, comprising a high-temperature evaporator, a high-temperature absorber, a high-temperature refrigerant pump, a high-temperature heat exchanger, and a high-temperature absorption solution pump for the heat pump cycle; a low-temperature evaporator, a low-temperature absorber, a low-temperature refrigerant pump, a low-temperature heat exchanger, a low-temperature absorption solution pump, and a dilute solution pump for the refrigeration cycle; and a generator, a condenser, and a condenser refrigerant water pump shared by both the heat pump and refrigeration cycles. The generator and condenser are housed in the same cavity, as are the low-temperature evaporator and the low-temperature absorber, which are separated by an insulation layer and arranged side-by-side in the same lower cylinder. The high-temperature evaporator and the high-temperature absorber are housed side-by-side in the upper cylinder of the same cavity, above the lower cylinder. This invention enables the production of both steam and chilled water on a single unit, achieving the goals of reducing unit costs, equipment investment, floor space, operating expenses, energy conservation, and emission reduction.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, specifically to a combined steam and refrigeration lithium bromide absorption chiller. Background Technology

[0002] A lithium bromide absorption chiller is a refrigeration or heating device that uses water as a refrigerant and lithium bromide aqueous solution as an absorbent. It mainly includes a generator, condenser, evaporator, absorber, connecting pipelines connecting the above components, and shielded pumps and valves installed on the connecting pipelines.

[0003] In situations where there is high-temperature waste water and both steam and refrigeration are required, in order to save energy, traditional process systems would first pass the high-temperature waste water into a flash evaporator for flash evaporation. The steam generated from the flash evaporation would then enter the steam network or be used in the production process. The waste water remaining after flash evaporation would then be passed into a flash evaporator, etc. Figure 1 The second type of lithium bromide absorption heat pump unit shown applies heat pump technology to recover the waste heat of the waste water to produce high-temperature hot water. The external system then feeds the high-temperature hot water into a flash evaporator for flash evaporation. The steam generated from the flash evaporation also enters the steam network or is used in the production process. The waste water from the heat pump is then fed into... Figure 2 The hot water type lithium bromide absorption chiller shown uses refrigeration technology to produce chilled water for production processes or air conditioning. It is evident that this system requires investment in two different types of units and a flash evaporation system to produce steam and chilled water separately, thus increasing initial investment costs, requiring a large footprint, and incurring high operating and management expenses. To achieve energy conservation, emission reduction, lower unit costs, reduce equipment investment, minimize footprint, and reduce operating and management costs, how to couple the functions of these two different types of units together to simultaneously achieve combined steam and refrigeration on a single lithium bromide absorption chiller unit has become one of the important research topics for technical personnel. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a combined steam and cooling lithium bromide absorption chiller unit, which can directly produce both steam and chilled water on the same unit, thereby reducing unit costs, equipment investment, floor space, operating and management expenses, and achieving energy conservation and emission reduction.

[0005] The objective of this invention is achieved as follows:

[0006] A combined steam and refrigeration lithium bromide absorption chiller includes a high-temperature evaporator, a high-temperature absorber, a high-temperature refrigerant pump, a high-temperature heat exchanger, and a high-temperature absorbent solution pump for constructing a heat pump cycle, and a low-temperature evaporator, a low-temperature absorber, a low-temperature refrigerant pump, a low-temperature heat exchanger, a low-temperature absorbent solution pump, and a dilute solution pump for constructing a refrigeration cycle, as well as a generator, a condenser, and a condenser refrigerant water pump shared in constructing the heat pump cycle and the refrigeration cycle; wherein the generator and condenser are in the same cavity, the low-temperature evaporator and the low-temperature absorber are in the same cavity, and these two cavities are separated by a heat insulation layer and arranged side by side in the same lower cylinder, located below the chiller unit; the high-temperature evaporator and the high-temperature absorber are in the upper cylinder of the same cavity and arranged side by side above the lower cylinder.

[0007] In this invention, the high-temperature absorption solution pump and the low-temperature absorption solution pump are arranged side by side at the bottom of the liquid bladder of the generator, and the upper part of the generator's spray plate is provided with a high-temperature spray pipe and a low-temperature spray pipe in parallel. The dilute solution pump is located at the bottom of the liquid bladder of the low-temperature absorber.

[0008] In this invention, a high-temperature absorption solution spray pipe is provided on the upper part of the spray plate of the high-temperature absorber, and the high-temperature absorption solution spray pipe is connected to the high-temperature absorption solution pump at the bottom of the liquid bladder of the generator through a connecting pipe; the high-temperature spray pipe is connected to the bottom of the liquid bladder of the high-temperature absorber through a connecting pipe; and the high-temperature heat exchanger is disposed between the connecting pipe of the high-temperature absorption solution spray pipe and the connecting pipe of the high-temperature spray pipe.

[0009] In this invention, the low-temperature spray pipe is connected to the dilute solution pump at the bottom of the liquid bladder of the low-temperature absorber via a connecting pipe; a low-temperature absorption solution spray pipe is provided on the upper part of the spray plate of the low-temperature absorber, and the low-temperature absorption solution spray pipe is connected to the low-temperature absorption solution pump at the bottom of the liquid bladder of the generator via a connecting pipe; the low-temperature heat exchanger is disposed between the connecting pipe of the low-temperature absorption solution spray pipe and the connecting pipe of the low-temperature spray pipe.

[0010] Preferably, a vapor-liquid separator for producing process steam is provided above the upper cylinder. The vapor-liquid separator is provided with a water inlet and a steam outlet. A hot water drain pipe and a vapor-liquid mixture riser pipe are also connected to the vapor-liquid separator. The lower ends of the hot water drain pipe and the vapor-liquid mixture riser pipe are respectively connected to the inlet and outlet of the heat transfer tube inside the high-temperature absorber. The upper end of the hot water drain pipe is connected to the bottom of the vapor-liquid separator. The upper end of the vapor-liquid mixture riser pipe enters the interior of the vapor-liquid separator and is provided with a vapor-liquid spray pipe at its end.

[0011] Preferably, the condenser refrigerant water pump is located at the bottom of the liquid bladder of the condenser, and the outlet of the condenser refrigerant water pump is provided with a main refrigerant water pipeline. The main refrigerant water pipeline is connected to a branch pipe for refrigerant water entering the high-temperature evaporator and a branch pipe for refrigerant water entering the low-temperature evaporator. The branch pipe for refrigerant water entering the high-temperature evaporator is connected to the bottom of the liquid bladder of the high-temperature evaporator, and the branch pipe for refrigerant water entering the low-temperature evaporator is connected to the throttling pipe of the low-temperature evaporator. A refrigerant water solenoid valve is provided on the branch pipe for refrigerant water entering the low-temperature evaporator.

[0012] Preferably, a refrigerant water level tank is provided outside the liquid bladder of the low-temperature evaporator, a refrigerant water inlet and outlet pipe is provided between the bottom of the refrigerant water level tank and the bottom of the liquid bladder of the low-temperature evaporator, a refrigerant water level balancing pipe is provided between the top of the refrigerant water level tank and the gas phase cavity of the low-temperature evaporator, and a refrigerant water high level electrode and a refrigerant water low level electrode are provided inside the refrigerant water level tank.

[0013] Preferably, the opening and closing of the refrigerant water solenoid valve is controlled by the refrigerant water high level electrode and the refrigerant water low level electrode. When the unit displays a low refrigerant water level, the refrigerant water solenoid valve opens; when the unit displays a high refrigerant water level, the refrigerant water solenoid valve closes.

[0014] In this invention, the high-temperature refrigerant pump is located at the bottom of the liquid bladder of the high-temperature evaporator; a high-temperature refrigerant spray pipe connected to the high-temperature refrigerant pump is provided on the upper part of the spray plate of the high-temperature evaporator; the low-temperature refrigerant pump is located at the bottom of the liquid bladder of the low-temperature evaporator; a low-temperature refrigerant spray pipe connected to the low-temperature refrigerant pump is provided on the upper part of the spray plate of the low-temperature evaporator.

[0015] In this invention, the low-temperature evaporator is provided with a cold water inlet and a cold water outlet connected to the internal heat transfer tubes of the low-temperature evaporator to produce process cold water; the internal heat transfer tubes of the high-temperature evaporator are connected in series with the internal heat transfer tubes of the generator; the high-temperature evaporator is provided with a waste hot water inlet for realizing the recovery and utilization of waste hot water heat; and the generator is provided with a waste hot water outlet for realizing the recovery and utilization of waste hot water heat.

[0016] In this invention, the unit has a heat pump cycle and a refrigeration cycle that are both interconnected and independent. The heat pump cycle can directly produce steam and consists of a generator, a condenser, a high-temperature evaporator, a high-temperature absorber, a vapor-liquid separator, a high-temperature heat exchanger, a high-temperature absorbent solution pump, a high-temperature refrigerant pump, and a condenser refrigerant water pump. The refrigeration cycle can produce chilled water and consists of a generator, a condenser, a low-temperature evaporator, a low-temperature absorber, a low-temperature heat exchanger, a low-temperature absorbent solution pump, a dilute solution pump, a low-temperature refrigerant pump, and a condenser refrigerant water pump. Among these, the generator, condenser, and condenser refrigerant water pump are common components of the heat pump cycle and the refrigeration cycle.

[0017] In this invention, the high-temperature absorption solution pump, high-temperature refrigerant pump, condenser refrigerant water pump, low-temperature absorption solution pump, dilute solution pump, and low-temperature refrigerant pump are all canned pumps.

[0018] Preferably, the steam makeup water from the external system first enters the vapor-liquid separator, then enters the heat transfer tubes of the high-temperature absorber to absorb heat and become a vapor-liquid mixture, before entering the vapor-liquid separator to separate the required steam; the cold water enters the heat transfer tubes of the low-temperature evaporator to cool down and becomes the required chilled water for production processes or air conditioning; the waste hot water is connected in series to first enter the heat transfer tubes of the high-temperature evaporator to cool down, then enters the heat transfer tubes of the generator to cool down, and then flows out of the unit; the cooling water is connected in series to first enter the heat transfer tubes of the low-temperature absorber to heat up, then enters the heat transfer tubes of the condenser to heat up, and then flows out of the unit; or, the cooling water can be connected in parallel to enter the heat transfer tubes of the low-temperature absorber and the condenser to heat up before flowing out of the unit.

[0019] The beneficial effects of this invention are:

[0020] This invention, through its novel process and structure, integrates both interconnected and independent heat pump and refrigeration cycles on a single unit. It recovers heat from the waste water after flash steaming at high temperatures. When both steam and chilled water are needed, the unit can simultaneously produce both. If the chilled water is used for air conditioning and refrigeration is not required in winter, simply shutting down the low-temperature absorption solution pump, the dilute solution pump, and the refrigerant water solenoid valve stops the refrigeration cycle, allowing the heat pump cycle to operate independently. The unit is easy to operate. The generator and condenser are shared components for both the heat pump and refrigeration cycles, resulting in a compact structure, reduced costs, lower equipment investment, smaller footprint, and lower operating expenses. Therefore, this combined steam and refrigeration lithium bromide absorption chiller unit achieves comprehensive economic and social benefits through energy conservation and emission reduction. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the working process of a previous type II lithium bromide absorption heat pump unit.

[0022] Figure 2 This is a schematic diagram of the working process of a traditional hot water type lithium bromide absorption chiller unit;

[0023] Figure 3 This is a schematic diagram of the overall structure and working process of a combined steam and refrigeration lithium bromide absorption chiller unit according to the present invention.

[0024] In the diagram: Absorber 1, Evaporator 2, Refrigerant Pump 3, Condenser 4, Generator 5, Condenser Refrigerant Water Pump 6, Concentrated Solution Pump 7, Heat Exchanger 8, Dilute Solution Pump 9, High-Temperature Absorber 10, High-Temperature Evaporator 11, High-Temperature Refrigerant Pump 12, Refrigerant Water Inlet Branch Pipe to High-Temperature Evaporator 13, Refrigerant Water Inlet Branch Pipe to Low-Temperature Evaporator 14, Refrigerant Water Solenoid Valve 15, Low-Temperature Absorber 16, Low-Temperature Evaporator 17, Refrigerant Water Level Balancing Pipe 18, High-Level Refrigerant Water Electrode 19, Low-Level Refrigerant Water Electrode 20, Refrigerant Water Level 21. Tank, 22. Refrigerant water inlet and outlet pipes, 23. Low temperature refrigerant pump, 24. Low temperature absorption solution pump, 25. High temperature absorption solution pump, 26. Low temperature heat exchanger, 27. Refrigerant water main pipe, 28. High temperature heat exchanger, 29. Low temperature spray pipe, 30. High temperature spray pipe, 31. Hot water drain pipe, 32. Vapor-liquid mixture riser pipe, 33. Vapor-liquid separator, 34. Steam outlet, 35. Makeup water inlet, 36. Residual hot water inlet, 37. Residual hot water outlet, 38. Cold water outlet, 39. Cooling water inlet, 40. Cold water inlet, 41. Cooling water outlet. Detailed Implementation

[0025] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0026] like Figure 3 The illustration shows an embodiment of a combined steam and refrigeration lithium bromide absorption chiller of the present invention, comprising a high-temperature evaporator 11, a high-temperature absorber 10, a high-temperature refrigerant pump 12, a high-temperature heat exchanger 18, and a high-temperature absorption solution pump 25 for constructing a heat pump cycle, and a low-temperature evaporator 17, a low-temperature absorber 16, a low-temperature refrigerant pump 23, a low-temperature heat exchanger 26, a low-temperature absorption solution pump 24, and a dilute solution pump 9 for constructing a refrigeration cycle, as well as a generator 5, a condenser 4, and a condenser refrigerant water pump 6 shared in constructing the heat pump cycle and the refrigeration cycle; wherein, the generator 5 and the condenser 4 are in the same cavity, the low-temperature evaporator 17 and the low-temperature absorber 16 are in the same cavity, and these two cavities are separated by a heat insulation layer and arranged side by side in the same lower cylinder, and placed below the unit; the high-temperature evaporator 11 and the high-temperature absorber 10 are in the upper cylinder of the same cavity and are arranged side by side above the lower cylinder.

[0027] In this embodiment, the high-temperature absorption solution pump 25 and the low-temperature absorption solution pump 24 are arranged side by side at the bottom of the liquid bladder of the generator, and the upper part of the spray plate of the generator 5 is provided with a high-temperature spray pipe 30 and a low-temperature spray pipe 29 in parallel. The dilute solution pump 9 is arranged at the bottom of the liquid bladder of the low-temperature absorber 16.

[0028] In this embodiment, a high-temperature absorption solution spray pipe is provided on the upper part of the spray plate of the high-temperature absorber 10. The high-temperature absorption solution spray pipe is connected to the high-temperature absorption solution pump 25 at the bottom of the liquid bladder of the generator 5 through a connecting pipe. The high-temperature spray pipe 30 is connected to the bottom of the liquid bladder of the high-temperature absorber 10 through a connecting pipe. The high-temperature heat exchanger 18 is disposed between the connecting pipe of the high-temperature absorption solution spray pipe and the connecting pipe of the high-temperature spray pipe 30.

[0029] In this embodiment, the low-temperature spray pipe 29 is connected to the dilute solution pump 9 at the bottom of the liquid bladder of the low-temperature absorber 16 via a connecting pipe; a low-temperature absorption solution spray pipe is provided on the upper part of the spray plate of the low-temperature absorber 16, and the low-temperature absorption solution spray pipe is connected to the low-temperature absorption solution pump 24 at the bottom of the liquid bladder of the generator 5 via a connecting pipe; the low-temperature heat exchanger 26 is disposed between the connecting pipe of the low-temperature absorption solution spray pipe and the connecting pipe of the low-temperature spray pipe 29.

[0030] Preferably, a vapor-liquid separator 33 for producing process steam is provided above the upper cylinder. The vapor-liquid separator 33 is provided with a water inlet 35 and a steam outlet 34. The vapor-liquid separator 33 is also connected to a hot water drain pipe 31 and a vapor-liquid mixture riser pipe 32. The lower ends of the hot water drain pipe 31 and the vapor-liquid mixture riser pipe 32 are respectively connected to the inlet and outlet of the heat transfer tube inside the high-temperature absorber 10. The upper end of the hot water drain pipe 31 is connected to the bottom of the vapor-liquid separator 33. The upper end of the vapor-liquid mixture riser pipe 32 enters the interior of the vapor-liquid separator 33 and is provided with a vapor-liquid spray pipe at its end.

[0031] Preferably, the condenser refrigerant water pump 6 is located at the bottom of the liquid bladder of the condenser 4, and the outlet of the condenser refrigerant water pump 6 is provided with a refrigerant water main pipe 27. The refrigerant water main pipe 27 is connected to the refrigerant water inlet branch pipe 13 of the high-temperature evaporator and the refrigerant water inlet branch pipe 14 of the low-temperature evaporator. The refrigerant water inlet branch pipe 13 of the high-temperature evaporator is connected to the bottom of the liquid bladder of the high-temperature evaporator 11, and the refrigerant water inlet branch pipe 14 of the low-temperature evaporator is connected to the throttling pipe of the low-temperature evaporator 17. A refrigerant water solenoid valve 15 is provided on the refrigerant water inlet branch pipe 14 of the low-temperature evaporator.

[0032] Preferably, a refrigerant water level tank 21 is provided outside the liquid bladder of the low-temperature evaporator 17. A refrigerant water inlet / outlet pipe 22 is provided between the bottom of the refrigerant water level tank 21 and the bottom of the liquid bladder of the low-temperature evaporator 17. A refrigerant water level balancing pipe 18 is provided between the top of the refrigerant water level tank 21 and the gas phase cavity of the low-temperature evaporator 17. A refrigerant water high level electrode 19 and a refrigerant water low level electrode 20 are provided inside the refrigerant water level tank 21.

[0033] Preferably, the opening and closing of the refrigerant water solenoid valve 15 is controlled by the refrigerant water high level electrode 19 and the refrigerant water low level electrode 20. When the unit displays a low refrigerant water level, the refrigerant water solenoid valve 15 is open, and when the unit displays a high refrigerant water level, the refrigerant water solenoid valve 15 is closed.

[0034] In this embodiment, the high-temperature refrigerant pump 12 is located at the bottom of the liquid bladder of the high-temperature evaporator 11; a high-temperature refrigerant spray pipe connected to the high-temperature refrigerant pump 12 is provided on the upper part of the spray plate of the high-temperature evaporator 11; the low-temperature refrigerant pump 23 is located at the bottom of the liquid bladder of the low-temperature evaporator 17; a low-temperature refrigerant spray pipe connected to the low-temperature refrigerant pump 23 is provided on the upper part of the spray plate of the low-temperature evaporator 17.

[0035] In this embodiment, the low-temperature evaporator 17 is provided with a cold water inlet 40 and a cold water outlet 38 connected to the internal heat transfer tubes of the low-temperature evaporator 17 to produce process cold water; the internal heat transfer tubes of the high-temperature evaporator 11 are connected in series with the internal heat transfer tubes of the generator 5, the high-temperature evaporator 11 is provided with a waste hot water inlet 36 for realizing the recovery and utilization of waste hot water heat, and the generator 5 is provided with a waste hot water outlet 37 for realizing the recovery and utilization of waste hot water heat.

[0036] In this embodiment, the unit has a heat pump cycle and a refrigeration cycle that are both interconnected and independent. The heat pump cycle can directly produce steam and consists of a generator 5, a condenser 4, a high-temperature evaporator 11, a high-temperature absorber 10, a vapor-liquid separator 33, a high-temperature heat exchanger 28, a high-temperature absorption solution pump 25, a high-temperature refrigerant pump 12, and a condenser refrigerant water pump 6. The refrigeration cycle can produce chilled water and consists of a generator 5, a condenser 4, a low-temperature evaporator 17, a low-temperature absorber 16, a low-temperature heat exchanger 26, a low-temperature absorption solution pump 24, a dilute solution pump 9, a low-temperature refrigerant pump 23, and a condenser refrigerant water pump 6. Among these, the generator 5, the condenser 4, and the condenser refrigerant water pump 6 are common components of the heat pump cycle and the refrigeration cycle.

[0037] In this embodiment, the high-temperature absorption solution pump 25, the high-temperature refrigerant pump 12, the condenser refrigerant water pump 6, the low-temperature absorption solution pump 24, the dilute solution pump 9, and the low-temperature refrigerant pump 23 are all canned pumps.

[0038] In this embodiment, the heat pump cycle of the unit is as follows: the dilute solution at the bottom of the high-temperature absorber 10 is cooled by the pressure difference and elevation difference between the upper and lower cylinders, and then flows by gravity into the high-temperature spray pipe 30 of the generator 5 and is concentrated into a concentrated solution. The generated refrigerant vapor is condensed into refrigerant water by the condenser 4. A portion of the concentrated solution in the liquid bladder of the generator 5 is lifted by the high-temperature absorption solution pump 25, heated by the high-temperature heat exchanger 28, and then sprayed into the high-temperature absorber 10, where it absorbs the high-temperature refrigerant vapor evaporated from the high-temperature evaporator 11 and becomes a dilute solution. The refrigerant water in the condenser 4 is lifted by the condenser refrigerant water pump 6, passes through the refrigerant water main pipe 27, and the refrigerant water enters the high-temperature evaporator branch pipe 13. A portion of the refrigerant water enters the liquid bladder of the high-temperature evaporator 11. The high-temperature refrigerant pump 12 pumps the refrigerant water in the liquid bladder of the high-temperature evaporator into the high-temperature evaporator 11 and sprays it onto the surface of the heat transfer tubes, where it is evaporated into high-temperature refrigerant vapor. This cycle continues continuously.

[0039] In this embodiment, the refrigeration cycle of the unit is as follows: the dilute solution at the bottom of the low-temperature absorber 16 is lifted by the dilute solution pump 9, and after being heated by the low-temperature heat exchanger 26, the dilute solution enters the low-temperature spray pipe 29 of the generator 5 and is concentrated into a concentrated solution. The generated refrigerant vapor is condensed into refrigerant water by the condenser 4. Another part of the concentrated solution in the liquid bladder of the generator 5 is lifted by the low-temperature absorption solution pump 24, cooled by the low-temperature heat exchanger 26, and then sprayed into the low-temperature absorber 16, where it absorbs the low-temperature refrigerant vapor evaporated from the low-temperature evaporator 17 and becomes a dilute solution. The refrigerant water in the condenser 4 is lifted by the condenser refrigerant water pump 6 and, after being controlled by the refrigerant water main pipeline 27, the refrigerant water inlet branch pipe 14 of the low-temperature evaporator, and the opening and closing of the refrigerant water solenoid valve 15, another part of the refrigerant water intermittently enters the throttling tube of the low-temperature evaporator 17 and flashes. The low-temperature refrigerant pump 23 pumps the refrigerant water in the liquid bladder of the low-temperature evaporator 17 into the low-temperature evaporator 17 and sprays it onto the surface of the heat transfer tube, where it is evaporated into low-temperature refrigerant vapor. This cycle continues continuously.

[0040] Preferably, the external system's steam makeup water enters the vapor-liquid separator 33 through the makeup water inlet 35. The makeup water and the separated hot water flow together by gravity through the hot water drain pipe 31 into the heat transfer tubes of the high-temperature absorber 10, absorbing heat and becoming a vapor-liquid mixture. This mixture then enters the vapor-liquid separator 33 through the vapor-liquid mixture riser pipe 32 to separate the required steam. The steam flows out of the unit from the steam outlet 34 and can be used in the steam network or directly for production processes. Cold water enters the low-temperature evaporator 17 through the cold water inlet 40, is cooled, and then flows out of the unit from the cold water outlet 38. The cold water coming out of the unit is the required chilled water for production processes or air conditioning; the waste hot water enters the heat transfer tube of the high-temperature evaporator 11 through the waste hot water inlet 36 for cooling, then enters the heat transfer tube of the generator 5 for further cooling, and finally flows out of the unit through the waste hot water outlet 37, where the heat of the waste hot water is recovered and utilized; the cooling water enters the heat transfer tube of the low-temperature absorber 16 through the cooling water inlet 39 for heating, then enters the heat transfer tube of the condenser 4 for further heating, and finally flows out of the unit through the cooling water outlet 41; or, the cooling water can be connected in parallel to enter the heat transfer tubes of the low-temperature absorber 39 and the condenser 4 for heating before flowing out of the unit.

[0041] This invention, through its novel process and structure, integrates both interconnected and independent heat pump and refrigeration cycles on a single unit. It recovers heat from the waste water after flash steaming at high temperatures. When both steam and chilled water are needed, the unit can simultaneously produce both. If the chilled water is used for air conditioning and refrigeration is not required in winter, simply shutting down the low-temperature absorption solution pump, the dilute solution pump, and the refrigerant water solenoid valve stops the refrigeration cycle, allowing the heat pump cycle to operate independently. The unit is easy to operate. The generator and condenser are shared components for both the heat pump and refrigeration cycles, resulting in a compact structure, reduced costs, lower equipment investment, smaller footprint, and lower operating expenses. Therefore, this combined steam and refrigeration lithium bromide absorption chiller unit achieves comprehensive economic and social benefits through energy conservation and emission reduction.

[0042] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A combined steam and refrigeration lithium bromide absorption chiller, characterized in that, The system includes a high-temperature evaporator (11), a high-temperature absorber (10), a high-temperature refrigerant pump (12), a high-temperature heat exchanger (28), and a high-temperature absorbent solution pump (25) for constructing a heat pump cycle; and a low-temperature evaporator (17), a low-temperature absorber (16), a low-temperature refrigerant pump (23), a low-temperature heat exchanger (26), a low-temperature absorbent solution pump (24), and a dilute solution pump (9) for constructing a refrigeration cycle; and a generator (5), a condenser (4), and a condenser refrigerant water pump (6) shared in constructing the heat pump cycle and the refrigeration cycle; wherein the generator (5) and the condenser (4) are in the same cavity, the low-temperature evaporator (17) and the low-temperature absorber (16) are in the same cavity, and these two cavities are separated by a heat insulation layer and arranged side by side in the same lower cylinder and placed below the unit; the high-temperature evaporator (11) and the high-temperature absorber (10) are in the upper cylinder of the same cavity and are arranged side by side above the lower cylinder; The high-temperature absorption solution pump (25) and the low-temperature absorption solution pump (24) are arranged side by side at the bottom of the liquid bladder of the generator. The upper part of the spray plate of the generator (5) is provided with a high-temperature spray pipe (30) and a low-temperature spray pipe (29) in parallel. The dilute solution pump (9) is arranged at the bottom of the liquid bladder of the low-temperature absorber (16). The high-temperature absorber (10) has a high-temperature absorbent solution spray pipe on its upper part, which is connected to the high-temperature absorbent solution pump (25) at the bottom of the liquid bladder of the generator (5) via a connecting pipe; the high-temperature spray pipe (30) is connected to the bottom of the liquid bladder of the high-temperature absorber (10) via a connecting pipe; and the high-temperature heat exchanger (28) is located between the connecting pipe of the high-temperature absorbent solution spray pipe and the connecting pipe of the high-temperature spray pipe (30). The low-temperature spray pipe (29) is connected to the dilute solution pump (9) at the bottom of the liquid bladder of the low-temperature absorber (16) via a connecting pipe; a low-temperature absorption solution spray pipe is provided on the upper part of the spray plate of the low-temperature absorber (16), and the low-temperature absorption solution spray pipe is connected to the low-temperature absorption solution pump (24) at the bottom of the liquid bladder of the generator (5) via a connecting pipe; the low-temperature heat exchanger (26) is located between the connecting pipe of the low-temperature absorption solution spray pipe and the connecting pipe of the low-temperature spray pipe (29).

2. The combined steam and refrigeration lithium bromide absorption chiller unit according to claim 1, characterized in that, A vapor-liquid separator (33) for producing process steam is provided above the upper cylinder. The vapor-liquid separator (33) is provided with a water inlet (35) and a steam outlet (34). A hot water drain pipe (31) and a vapor-liquid mixture riser pipe (32) are also connected to the vapor-liquid separator (33). The lower end of the hot water drain pipe (31) and the lower end of the vapor-liquid mixture riser pipe (32) are respectively connected to the inlet and outlet of the heat transfer tube inside the high temperature absorber (10). The upper end of the hot water drain pipe (31) is connected to the bottom of the vapor-liquid separator (33). The upper end of the vapor-liquid mixture riser pipe (32) enters the interior of the vapor-liquid separator (33) and is provided with a vapor-liquid spray pipe at its end.

3. The combined steam and refrigeration lithium bromide absorption chiller unit according to claim 1, characterized in that, The condenser refrigerant water pump (6) is located at the bottom of the liquid bladder of the condenser (4). The outlet of the condenser refrigerant water pump (6) is provided with a refrigerant water main pipeline (27). The refrigerant water main pipeline (27) is connected to the refrigerant water inlet branch pipe (13) of the high-temperature evaporator and the refrigerant water inlet branch pipe (14) of the low-temperature evaporator. The refrigerant water inlet branch pipe (13) of the high-temperature evaporator is connected to the bottom of the liquid bladder of the high-temperature evaporator (11), and the refrigerant water inlet branch pipe (14) of the low-temperature evaporator is connected to the throttling pipe of the low-temperature evaporator (17). A refrigerant water solenoid valve (15) is provided on the refrigerant water inlet branch pipe (14).

4. A combined steam and refrigeration lithium bromide absorption chiller unit according to claim 3, characterized in that, A refrigerant water level tank (21) is provided outside the liquid bladder of the low-temperature evaporator (17). A refrigerant water inlet / outlet pipe (22) is provided between the bottom of the refrigerant water level tank (21) and the bottom of the liquid bladder of the low-temperature evaporator (17). A refrigerant water level balancing pipe (18) is provided between the top of the refrigerant water level tank (21) and the gas phase cavity of the low-temperature evaporator (17). A refrigerant water high level electrode (19) and a refrigerant water low level electrode (20) are provided inside the refrigerant water level tank (21).

5. A combined steam and refrigeration lithium bromide absorption chiller unit according to claim 4, characterized in that, The opening and closing of the refrigerant water solenoid valve (15) is controlled by the refrigerant water high level electrode (19) and the refrigerant water low level electrode (20). When the unit displays a low refrigerant water level, the refrigerant water solenoid valve (15) opens, and when the unit displays a high refrigerant water level, the refrigerant water solenoid valve (15) closes.

6. A combined steam and refrigeration lithium bromide absorption chiller unit according to claim 1, characterized in that, The high-temperature refrigerant pump (12) is located at the bottom of the liquid bladder of the high-temperature evaporator (11); a high-temperature refrigerant spray pipe connected to the high-temperature refrigerant pump (12) is provided on the upper part of the spray plate of the high-temperature evaporator (11); the low-temperature refrigerant pump (23) is located at the bottom of the liquid bladder of the low-temperature evaporator (17); a low-temperature refrigerant spray pipe connected to the low-temperature refrigerant pump (23) is provided on the upper part of the spray plate of the low-temperature evaporator (17).

7. A combined steam and refrigeration lithium bromide absorption chiller unit according to claim 1, characterized in that, The low-temperature evaporator (17) is provided with a cold water inlet (40) and a cold water outlet (38) connected to the internal heat transfer tubes of the low-temperature evaporator (17) to produce process cold water; the internal heat transfer tubes of the high-temperature evaporator (11) are connected in series with the internal heat transfer tubes of the generator (5), the high-temperature evaporator (11) is provided with a waste hot water inlet (36) for realizing the recovery and utilization of waste hot water heat, and the generator (5) is provided with a waste hot water outlet (37) for realizing the recovery and utilization of waste hot water heat.

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