A high energy efficient bromine electrical coupling system

Abstract

The technical scheme of the present application discloses a high-energy-efficiency bromine electric coupling system, which comprises a lithium bromide hot water unit, a heating heat pump unit, a first heat exchanger and a second heat exchanger; the lithium bromide hot water unit comprises an absorber, a generator, a first evaporator and a first condenser; the inlet of high-temperature waste heat water is connected with the hot side of the first heat exchanger, the generator, the hot side of the second heat exchanger and the first evaporator in sequence; the outlet of the first evaporator is connected with the third evaporator, the second evaporator in the heating heat pump unit and the outlet of the high-temperature waste heat water in sequence; the inlet of heating water is connected with the inlet of the second condenser; the outlet of the second condenser is divided into two routes, one of which is connected with the cold side of the second heat exchanger, and the other of which is connected with the first condenser, the absorber, the third condenser and the cold side of the first heat exchanger in sequence; the cold side outlet of the first heat exchanger is connected with the cold side outlet of the second heat exchanger after pipeline convergence, and then connected with the outlet of the heating water; the energy efficiency is improved, and cooling and heating can be simultaneously realized.

Description

Technical Field

[0001] This invention relates to the field of heating engineering technology, and more specifically to a high-efficiency bromine-electrocoupling system. Background Technology

[0002] Currently, many industrial sites generate significant amounts of medium- and high-temperature waste heat. Absorption heat exchangers are a widely used method for utilizing this waste heat. For example, lithium bromide units use waste water as a driving heat source to produce hotter water for further heating. The bromine-electric coupling system is a composite energy system solution that combines a lithium bromide unit with an electrically driven refrigeration / heating unit. Existing bromine-electric coupling systems can only meet heating needs, and are limited by the relatively high return water temperature (around 40°C), resulting in low heat extraction capacity and efficiency for the lithium bromide unit from the high-temperature waste water. This fails to achieve the dual goals of increasing the heating outlet water temperature and improving system efficiency. A common solution is to combine the lithium bromide unit with a plate heat exchanger to improve heat extraction from the high-temperature waste water. However, this is still limited by the high return water temperature (typically above 30°C), meaning some heat remains unutilized. Another solution is to use electric chillers to cool the heating return water. While this lowers the return water temperature, the outlet water temperature of lithium bromide chillers is typically below 70°C, making it impossible to achieve high-temperature outlet water. The portion exceeding 70°C requires further electric heating, resulting in low system efficiency and a coefficient of performance (COP) generally below 4, thus increasing energy consumption. Furthermore, many process environments require chilled water year-round, such as data centers which need cooling in all seasons and heating in winter. Since the return water temperature of the high-temperature waste water from the combination of lithium bromide chillers and plate heat exchangers is usually above 30°C, it cannot be used for cooling. Therefore, additional chillers are needed for cooling, further reducing system efficiency.

[0003] Patent application CN121557631A discloses a large temperature difference device, comprising: a waste hot water pipeline that sequentially passes through the tube side of a generator, the hot side of a heat exchanger, and the tube side of an evaporator; a second refrigerant is divided into multiple paths, one of which passes through the tube side of an absorber, and the other does not pass through the tube side of an absorber; furthermore, one of the multiple paths exchanges heat with the waste hot water connecting the outlet of the generator tube side and the inlet of the evaporator tube side through a heat exchanger, and the other path passes through the tube side of a first condenser; it also sequentially passes through a compressor, the shell side of a second condenser, and an electric... The secondary expansion valve; the waste hot water releases heat through multiple channels and the secondary refrigerant absorbs heat through multiple channels and then exchanges heat to the demineralized water / hot water, achieving a large temperature difference cooling of the waste hot water while reusing the heat to produce the required heat and high-temperature demineralized water / hot water / steam; however, the waste hot water only exchanges heat in the generator, heat exchanger and evaporator, and the return water temperature of the waste hot water is relatively high, so a large amount of heat cannot be utilized. The secondary refrigerant absorbs heat through multiple channels and then finally heats up in the high-temperature section through the compressor and the second condenser, which is inefficient and cannot achieve the dual functions of heating and cooling. Patent application CN219454051U discloses a heat exchange unit for a heating station, in which high-temperature waste water undergoes heat exchange in three ways. The first way is that water from the primary network supply pipe (equivalent to high-temperature waste water) first flows into the generator of a lithium bromide heat pump, then enters the first heat exchanger, flows out of the first heat exchanger and into the evaporator of the lithium bromide heat pump, and then flows back into the primary network return pipe, where it heats the water in the secondary network supply pipe. The second way is that the high-temperature water from the primary network supply pipe can also flow directly into the second heat exchanger, where it heats the water in the secondary network. The third way is... Water flowing out from the third outlet of the second heat exchanger is guided into the evaporator. The lithium bromide heat pump extracts heat from the primary network water that has undergone heat exchange in the second heat exchanger, thereby reducing the temperature of the primary network water that has undergone heat exchange in the second heat exchanger. However, this only divides the high-temperature waste water into two parts. The first part undergoes heat exchange directly through the first method, while the second part undergoes heat exchange through the second and third methods. This only reduces the return water temperature of the high-temperature waste water in the second part after heat exchange, while the return water temperature of the high-temperature waste water in the first part, which undergoes heat exchange through the lithium bromide heat pump and the first heat exchanger, remains unchanged. A large amount of heat remains unutilized, and the dual functions of heating and cooling cannot be achieved.

[0004] Therefore, it is necessary to develop a high-efficiency bromine-electric coupling system that can fully extract and utilize the heat from high-temperature waste water, and simultaneously achieve the dual functions of high-temperature heating and cooling. Summary of the Invention

[0005] To address the existing technical problems, this invention provides a high-efficiency bromine-electric coupling system. By connecting a lithium bromide hot water unit, a heating heat pump unit, a first heat exchanger, and a second heat exchanger, it fully utilizes the heat of high-temperature waste hot water, while reducing power consumption and improving energy efficiency, thus achieving dual functions of cooling and heating.

[0006] The technical solution of the present invention is: a high-efficiency bromine-electrode coupling system, comprising a lithium bromide hot water unit, a heating heat pump unit, a first heat exchanger, and a second heat exchanger;

[0007] The lithium bromide hot water unit includes an absorber, a generator, a first evaporator, and a first condenser; the inlet of the high-temperature waste hot water is sequentially connected to the hot side of the first heat exchanger, the generator, the hot side of the second heat exchanger, and the first evaporator.

[0008] The heating heat pump unit includes heating heat pump unit I and heating heat pump unit II. Heating heat pump unit I includes a second evaporator, a second condenser and a second compressor connected to each other. Heating heat pump unit II includes a third evaporator, a third condenser and a third compressor connected to each other. The outlet of the first evaporator is connected to the third evaporator and the second evaporator in sequence. The outlet of the second evaporator is connected to the outlet of the high-temperature waste hot water.

[0009] The heating water inlet is connected to the inlet of the second condenser. The outlet of the second condenser is divided into two paths: one path is connected to the cold side inlet of the second heat exchanger, and the other path is connected in sequence to the cold side of the first condenser, absorber, third condenser, and first heat exchanger. The cold side outlet of the first heat exchanger and the cold side outlet of the second heat exchanger are merged through pipelines and then connected to the heating water outlet.

[0010] Furthermore, the heating heat pump unit also includes a heating heat pump unit III, which includes a fourth condenser, a fourth evaporator, and a fourth compressor. The fourth evaporator is connected between the third evaporator and the second evaporator, the fourth condenser is connected between the absorber and the third condenser, and the fourth compressor is connected to both the fourth evaporator and the fourth condenser.

[0011] Furthermore, the heating heat pump unit III includes at least one set of fourth condenser, fourth evaporator and fourth compressor. The fourth condenser of each set is connected in series, the fourth evaporator of each set is connected in series, and the fourth compressor of each set is connected to the fourth evaporator and fourth condenser of the corresponding set respectively.

[0012] The fourth condenser, fourth evaporator, and fourth compressor in each group operate independently.

[0013] Furthermore, in the lithium bromide hot water unit, high-temperature waste water enters the generator, where it heats the dilute solution. Part of the refrigerant water in the dilute solution evaporates, forming water vapor and a concentrated solution. The water vapor enters the first condenser, where it releases heat and condenses into water. The concentrated solution returns to the absorber. The refrigerant water in the first condenser is throttled and then enters the first evaporator. The refrigerant water in the first evaporator absorbs heat from the high-temperature waste water and evaporates into water vapor. The unevaporated refrigerant water is circulated and sprayed by the refrigerant pump. The water vapor enters the absorber, where it is absorbed by the concentrated solution and becomes a dilute solution. The dilute solution is then transported to the generator. The dilute solution transported from the generator to the absorber and the concentrated solution transported from the absorber to the generator exchange heat through a solution heat exchanger. The heating water first enters the first condenser to absorb heat from the water vapor in the generator and is heated, and then enters the absorber to absorb heat from the water vapor in the first evaporator and is heated a second time.

[0014] Furthermore, the second, third, and fourth compressors of the heating heat pump unit are centrifugal compressors.

[0015] Furthermore, the first heat exchanger and the second heat exchanger are plate heat exchangers.

[0016] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows:

[0017] (1) Before entering the lithium bromide water heater unit for heat exchange, the high-temperature waste water of the present invention first enters the first heat exchanger to exchange heat with the heating water. That is, the temperature rise of the high-temperature section of the heating water is achieved by heat exchange with the high-temperature waste water in the first heat exchanger, rather than using the heating heat pump unit with electric heating. The heating heat pump unit has low efficiency in raising the temperature of the heating water in the high-temperature section. Using high-temperature waste water to raise the temperature of the high-temperature section of the heating water greatly improves the heating efficiency of the high-temperature section of the heating water. At the same time, the heat energy of the high-temperature waste water is fully utilized.

[0018] (2) When heating water is heated, it first enters the heating heat pump unit I for heating. The temperature difference before and after heating is small in this part, which is easy to achieve and has high efficiency. Then it is divided into two paths. One path is heated through the second heat exchanger, and the other path is heated through the lithium bromide water heater, heating heat pump unit II, heating heat pump unit III, and the first heat exchanger. In addition, since the temperature of the heating water after entering the heating heat pump unit I is high, the temperature of the high-temperature waste water entering the first evaporator of the lithium bromide water heater after heat exchange in the second heat exchanger is also high. Therefore, the heating water coming out of the heating heat pump unit I first enters the first condenser for heating and then enters the absorber for secondary heating, thereby increasing the outlet temperature of the heating water of the lithium bromide water heater.

[0019] (3) Under the same inlet temperature and flow rate of high-temperature waste hot water and the same inlet temperature and flow rate of heating water, the present invention can greatly reduce power consumption, extract more heat energy from high-temperature waste hot water, improve energy efficiency, significantly reduce the outlet temperature of high-temperature waste hot water, and can be used for cooling, realizing the dual functions of high-temperature heating and cooling.

[0020] (4) In this invention, the heat exchange of heating water in the first heat exchanger and the heating heat pump unit I results in a smaller temperature difference in the heating water in the second heat exchanger, the first heat exchanger, the heating heat pump unit and the lithium bromide water heater unit, which significantly reduces power consumption and greatly improves energy efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of Example 1;

[0022] Figure 2 This is a schematic diagram of the circulation structure of the lithium bromide hot water unit of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the heating heat pump unit I of the present invention;

[0024] Figure 4 This is a structural schematic diagram showing the temperature at different locations in Example 1;

[0025] Figure 5 This is a schematic diagram of the structure of Comparative Example 1.

[0026] In the diagram, 1. Lithium bromide water heater unit; 2. Heating heat pump unit I; 3. Heating heat pump unit II; 4. Heating heat pump unit III; 5. First heat exchanger; 6. Second heat exchanger; 11. Absorber; 12. Generator; 13. First evaporator; 14. First condenser; 15. Solution heat exchanger; 21. Second evaporator; 22. Second condenser; 23. Second compressor; 31. Third evaporator; 32. Third condenser; 41. Fourth condenser; 42. Fourth evaporator. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to specific embodiments.

[0028] Example 1

[0029] like Figures 1-3 As shown, a high-efficiency bromine-electric coupling system includes a lithium bromide hot water unit 1, a heating heat pump unit, a first heat exchanger 5, and a second heat exchanger 6.

[0030] The lithium bromide hot water unit 1 includes an absorber 11, a generator 12, a first evaporator 13, and a first condenser 14; the inlet of the high-temperature waste hot water is connected in sequence to the hot side of the first heat exchanger 5, the generator 12, the hot side of the second heat exchanger 6, and the first evaporator 13.

[0031] Specifically, the inlet of the high-temperature waste water is connected to the hot-side inlet of the first heat exchanger 5, and the hot-side outlet of the first heat exchanger 5 is connected to the inlet of the generator 12; the outlet of the generator 12 is connected to the hot-side inlet of the second heat exchanger 6, and the hot-side outlet of the second heat exchanger 6 is connected to the inlet of the first evaporator 13.

[0032] The heating heat pump unit includes heating heat pump unit I 2 and heating heat pump unit II 3. Heating heat pump unit I 2 includes a second evaporator 21, a second condenser 22 and a second compressor 23 connected to each other. Heating heat pump unit II 3 includes a third evaporator 31, a third condenser 32 and a third compressor connected to each other. The outlet of the first evaporator 13 is connected to the third evaporator 31 and the second evaporator 21 in sequence. The outlet of the second evaporator 21 is connected to the outlet of the high-temperature waste hot water.

[0033] The heating water inlet is connected to the inlet of the second condenser 22. The outlet of the second condenser 22 is divided into two paths: one path is connected to the cold side inlet of the second heat exchanger 6, and the other path is connected in sequence to the cold side of the first condenser 14, the absorber 11, the third condenser 32, and the first heat exchanger 5. The cold side outlet of the first heat exchanger 5 and the cold side outlet of the second heat exchanger 6 are merged through pipelines and then connected to the heating water outlet.

[0034] Specifically, the outlet of the second condenser 22 is divided into two paths: one path is connected to the cold side inlet of the second heat exchanger 6, and the other path is connected to the inlet of the first condenser 14. The outlet of the first condenser 14 is connected to the inlet of the absorber 11, the outlet of the absorber 11 is connected to the inlet of the third condenser 32, and the outlet of the third condenser 32 is connected to the cold side inlet of the first heat exchanger 5.

[0035] Furthermore, the heating heat pump unit also includes a heating heat pump unit III 4, which includes a fourth condenser 41, a fourth evaporator 42 and a fourth compressor. The fourth evaporator 42 is connected between the third evaporator 31 and the second evaporator 21, the fourth condenser 41 is connected between the absorber 11 and the third condenser 32, and the fourth compressor is connected to the fourth evaporator 42 and the fourth condenser 41 respectively.

[0036] Furthermore, the heating heat pump unit III 4 includes at least one set of fourth condenser 41, fourth evaporator 42 and fourth compressor. The fourth condenser 41 of each set is connected in series, the fourth evaporator 42 of each set is connected in series, and the fourth compressor of each set is connected to the fourth evaporator 42 and the fourth condenser 41 of the corresponding set respectively.

[0037] Each group's fourth condenser 41, fourth evaporator 42, and fourth compressor operate independently. In this embodiment 1, the heating heat pump unit III 4 is equipped with one group of fourth condensers 41, fourth evaporators 42, and fourth compressors.

[0038] Furthermore, in the lithium bromide hot water unit 1, the high-temperature waste hot water enters the generator 12, where it heats the dilute solution. Part of the refrigerant water in the dilute solution evaporates, forming water vapor and a concentrated solution. The water vapor enters the first condenser 14, where it releases heat and condenses into water. The concentrated solution returns to the absorber 11. The refrigerant water in the first condenser 14 is then throttled and enters the first evaporator 13 (e.g., ...). Figure 2 As shown), the refrigerant water in the first evaporator 13 absorbs heat from the high-temperature waste water and evaporates into water vapor. The unevaporated refrigerant water is circulated and sprayed by the refrigerant pump (as shown). Figure 2 As shown), water vapor enters absorber 11 and is absorbed by the concentrated solution in absorber 11, becoming a dilute solution. The dilute solution is then transported to generator 12, and the concentrated solution (as shown) is transported from generator 12 to absorber 11... Figure 2 (as shown) and a dilute solution (such as) supplied from absorber 11 to generator 12. Figure 2 (As shown) Heat exchange is performed through the solution heat exchanger 15; the heating water first enters the first condenser 14 to absorb heat from the water vapor from the generator 12 to raise its temperature, and then enters the absorber 11 to absorb heat from the water vapor from the first evaporator 13 to raise its temperature a second time.

[0039] The lithium bromide heat pump unit 1, the solution heat exchanger 15, and the circulation of dilute solution, concentrated solution, and water vapor are existing technologies.

[0040] Furthermore, the second compressor 23, the third compressor, and the fourth compressor of the heating heat pump unit are centrifugal compressors.

[0041] Furthermore, the first heat exchanger 5 and the second heat exchanger 6 are plate heat exchangers.

[0042] When the high-efficiency bromine electrocoupling system of Embodiment 1 is working, such as Figure 1As shown, high-temperature waste water is transported from the inlet of high-temperature waste water to the hot side inlet of the first heat exchanger 5, and enters the first heat exchanger 5 for cooling. After cooling, the high-temperature waste water enters the generator 12 of the lithium bromide water heater unit 1 for further cooling. Then, the high-temperature waste water enters the second heat exchanger 6 through the hot side inlet for further cooling, and then is transported from the hot side outlet of the second heat exchanger 6 to the first evaporator 13 of the lithium bromide water heater unit 1 for further cooling. After exiting the outlet of the first evaporator 13, the high-temperature waste water sequentially enters the third evaporator 31 of the heating heat pump unit II 3, the fourth evaporator 42 of the heating heat pump unit III 4, and the second evaporator 21 of the heating heat pump unit I 2 for further cooling, and finally flows out from the outlet of the high-temperature waste water to obtain low-temperature water that can be used for refrigeration.

[0043] like Figure 1 As shown, heating water enters the second condenser 22 of heating heat pump unit I 2 through the heating water inlet and is heated. Then it is divided into two paths. One path enters the second heat exchanger 6 through the cold side inlet and exchanges heat with the high-temperature waste water to raise its temperature. The other path enters the first condenser 14 and absorber 11 of lithium bromide water heater unit 1 in sequence to raise its temperature. After exiting the absorber 11, it enters the fourth condenser 41 of heating heat pump unit III 4 and the third condenser 32 of heating heat pump unit II 3 in sequence to raise its temperature step by step. Then it enters the first heat exchanger 5 through the cold side inlet and exchanges heat with the high-temperature waste water to raise its temperature. The heating water from the cold side outlet of the first heat exchanger 5 and the cold side outlet of the second heat exchanger 6 merges in the pipeline and finally flows out from the heating water outlet to obtain heating water with a higher temperature for heating.

[0044] In heating heat pump unit I 2, the high-temperature waste water enters the second evaporator 21, where it exchanges heat with the refrigerant. The refrigerant absorbs heat, changing from a liquid to a gaseous state, and then enters the second compressor 23 for compression, becoming a high-temperature, high-pressure gaseous refrigerant. It then enters the second condenser 22, where it exchanges heat with the heating water entering the condenser. The refrigerant releases heat, condensing from a gaseous state to a liquid state. After throttling and cooling, it flows back to the second evaporator 21 for circulation. The refrigerant circulation is existing technology. The circulation paths of the high-temperature waste water, heating water, and refrigerant in each heating heat pump unit are independent and identical to those in heating heat pump unit I 2. Specifically, the circulation paths of the high-temperature waste water, heating water, and refrigerant in heating heat pump unit II 3 are the same as those in heating heat pump unit I 2, and the circulation paths of the high-temperature waste water, heating water, and refrigerant in heating heat pump unit III 4 are the same as those in heating heat pump unit I 2.

[0045] Example 2

[0046] The difference between Example 2 and Example 1 is that Example 2 only includes heating heat pump unit I 2 and heating heat pump unit II 3, and does not include heating heat pump unit III 4. The specific structure is as follows:

[0047] A high-efficiency bromine-electrode coupling system includes a lithium bromide hot water unit 1, a heating heat pump unit, a first heat exchanger 5, and a second heat exchanger 6.

[0048] The lithium bromide hot water unit 1 includes an absorber 11, a generator 12, a first evaporator 13, and a first condenser 14; the inlet of the high-temperature waste hot water is connected to the hot side inlet of the first heat exchanger 5, and the hot side outlet of the first heat exchanger 5 is connected to the inlet of the generator 12; the outlet of the generator 12 is connected to the hot side inlet of the second heat exchanger 6, and the hot side outlet of the second heat exchanger 6 is connected to the inlet of the first evaporator 13.

[0049] The heating heat pump unit includes heating heat pump unit I 2 and heating heat pump unit II 3. Heating heat pump unit I 2 includes a second evaporator 21, a second condenser 22 and a second compressor 23 connected to each other. Heating heat pump unit II 3 includes a third evaporator 31, a third condenser 32 and a third compressor connected to each other. The outlet of the first evaporator 13 is connected to the third evaporator 31 and the second evaporator 21 in sequence. The outlet of the second evaporator 21 is connected to the outlet of the high-temperature waste hot water.

[0050] The heating water inlet is connected to the inlet of the second condenser 22. The outlet of the second condenser 22 is divided into two paths: one path is connected to the cold side inlet of the second heat exchanger 6, and the other path is connected to the inlet of the first condenser 14. The outlet of the first condenser 14 is connected to the inlet of the absorber 11. The outlet of the absorber 11 is connected to the inlet of the third condenser 32. The outlet of the third condenser 32 is connected to the cold side inlet of the first heat exchanger 5. The cold side outlet of the first heat exchanger 5 and the cold side outlet of the second heat exchanger 6 are merged through pipelines and then connected to the heating water outlet.

[0051] Furthermore, in the lithium bromide hot water unit 1, the high-temperature waste water enters the generator 12, where it heats the dilute solution. Part of the refrigerant water in the dilute solution evaporates, forming water vapor and a concentrated solution. The water vapor enters the first condenser 14, where it releases heat and condenses into water. The concentrated solution returns to the absorber 11. The refrigerant water in the first condenser 14 is throttled and then enters the first evaporator 13. The refrigerant water in the first evaporator 13 absorbs heat from the high-temperature waste water and evaporates into water vapor. The unevaporated refrigerant water is circulated and sprayed by the refrigerant pump. The water vapor enters the absorber 11 and is absorbed by the concentrated solution in the absorber 11, becoming a dilute solution. The dilute solution is then transported to the generator 12. The concentrated solution transported from the generator 12 to the absorber 11 and the dilute solution transported from the absorber 11 to the generator 12 exchange heat through the solution heat exchanger 15. The heating water first enters the first condenser 14 to absorb heat from the water vapor in the generator 12 and is heated, and then enters the absorber 11 to absorb heat from the water vapor in the first evaporator 13 and is heated a second time.

[0052] The lithium bromide heat pump unit 1, the solution heat exchanger 15, and the circulation of dilute solution, concentrated solution, and water vapor are existing technologies.

[0053] Furthermore, the second compressor 23 and the third compressor of the heating heat pump unit are centrifugal compressors.

[0054] Furthermore, the first heat exchanger 5 and the second heat exchanger 6 are plate heat exchangers.

[0055] When the high-efficiency bromine-electrode coupling system of this embodiment 2 is working, the high-temperature waste water is transported from the inlet of the high-temperature waste water to the hot side inlet of the first heat exchanger 5, and enters the first heat exchanger 5 for cooling. The cooled high-temperature waste water enters the generator 12 of the lithium bromide water heater unit 1 for further cooling. Then, the high-temperature waste water enters the second heat exchanger 6 through the hot side inlet for further cooling, and then is transported from the hot side outlet of the second heat exchanger 6 to the first evaporator 13 of the lithium bromide water heater unit 1 for further cooling. The high-temperature waste water that comes out of the outlet of the first evaporator 13 enters the third evaporator 31 of the heating heat pump unit II 3 and the second evaporator 21 of the heating heat pump unit I 2 for further cooling, and finally flows out from the outlet of the high-temperature waste water to obtain low-temperature water that can be used for refrigeration.

[0056] Heating water enters the second condenser 22 of the heating heat pump unit I 2 through the heating water inlet and is heated. Then it splits into two paths. One path enters the second heat exchanger 6 through the cold side inlet and exchanges heat with the high-temperature waste water to raise its temperature. The other path enters the first condenser 14 and the absorber 11 of the lithium bromide water heater unit 1 in sequence to raise its temperature. After exiting the absorber 11, it enters the third condenser 32 of the heating heat pump unit II 3 to raise its temperature. Then it enters the first heat exchanger 5 through the cold side inlet and exchanges heat with the high-temperature waste water to raise its temperature. The heating water from the cold side outlet of the first heat exchanger 5 and the cold side outlet of the second heat exchanger 6 merges in the pipeline and finally flows out from the heating water outlet to obtain heating water with a higher temperature for heating.

[0057] Comparative Example 1

[0058] The differences between Comparative Example 1 and Example 1 are as follows: (1) The first heat exchanger 5 is missing, and the high-temperature waste hot water directly enters the generator 12 of the lithium bromide water heater unit 1 from the inlet of the high-temperature waste hot water for heat exchange; (2) The heating water is directly divided into two paths from the inlet of the heating water, one path enters the absorber 11 of the lithium bromide water heater unit 1, and the other path enters the second heat exchanger 6; (3) In the lithium bromide water heater unit 1, the heating water first enters the absorber 11 to absorb the heat from the water vapor of the first evaporator 13 to raise its temperature, and then enters the first condenser 14 to absorb the heat from the water vapor of the generator 12 for a second temperature increase. The specific structure is as follows:

[0059] like Figure 5 As shown, a conventional bromine-electric coupling system includes a lithium bromide hot water unit 1, a heating heat pump unit, and a second heat exchanger 6.

[0060] The lithium bromide water heater group 1 includes an absorber 11, a generator 12, a first evaporator 13, and a first condenser 14; the inlet of the high-temperature waste water is connected to the inlet of the generator 12; the outlet of the generator 12 is connected to the hot side inlet of the second heat exchanger 6, and the hot side outlet of the second heat exchanger 6 is connected to the inlet of the first evaporator 13.

[0061] The heating heat pump unit includes heating heat pump unit I 2, heating heat pump unit II 3, and heating heat pump unit III 4. Heating heat pump unit I 2 includes a second evaporator 21, a second condenser 22, and a second compressor 23 connected to each other. Heating heat pump unit II 3 includes a third evaporator 31, a third condenser 32, and a third compressor connected to each other. Heating heat pump unit III 4 includes a fourth condenser 41, a fourth evaporator 42, and a fourth compressor connected to each other. The outlet of the first evaporator 13 is connected in sequence to the fourth evaporator 42, the third evaporator 31, and the second evaporator 21. The outlet of the second evaporator 21 is connected to the outlet of the high-temperature waste hot water.

[0062] The heating water inlet is divided into two paths: one path is connected to the cold side inlet of the second heat exchanger 6, and the other path is connected to the inlet of the absorber 11. The outlet of the absorber 11 is connected to the inlet of the first condenser 14. The outlet of the first condenser 14 is connected in sequence to the second condenser 22, the third condenser 32, and the fourth condenser 41. The outlet of the fourth condenser 41 and the cold side outlet of the second heat exchanger 6 are merged through a pipeline and then connected to the outlet of the heating water.

[0063] When the ordinary bromine-electrode coupling system of Comparative Example 1 is working, the high-temperature waste water is transported from the inlet of the high-temperature waste water to the generator 12 of the lithium bromide water heater unit 1 for cooling. Then, the high-temperature waste water enters the second heat exchanger 6 through the hot side inlet for cooling, and is then transported from the hot side outlet of the second heat exchanger 6 to the first evaporator 13 of the lithium bromide water heater unit 1 for cooling. The high-temperature waste water after exiting the outlet of the first evaporator 13 enters the fourth evaporator 42 of the heating heat pump unit III 4, the third evaporator 31 of the heating heat pump unit II 3, and the second evaporator 21 of the heating heat pump unit I 2 for cooling, and finally flows out from the outlet of the high-temperature waste water to obtain the cooled high-temperature waste water.

[0064] After entering through the heating water inlet, the water splits into two streams. One stream enters the second heat exchanger 6 through the cold side inlet to exchange heat with the high-temperature waste water and raise its temperature. The other stream sequentially enters the absorber 11 and the first condenser 14 of the lithium bromide water heater unit 1 for further heating. After exiting the first condenser 14, the water sequentially enters the second condenser 22 of the heating heat pump unit I 2, the third condenser 32 of the heating heat pump unit II 3, and the fourth condenser 41 of the heating heat pump unit III 4 for further heating. The heating water exiting the fourth condenser 41 and the heating water exiting the cold side outlet of the second heat exchanger 6 merge in the pipeline and finally flow out from the heating water outlet, resulting in high-temperature heating water for heating purposes.

[0065] In Example 1, the heating water from the heating heat pump unit I first enters the first condenser. Compared with Comparative Example 1, the inlet and outlet temperatures of the generator in Example 1 are both lower, indicating that the generator pressure is lower. Since the generator pressure is approximately equal to the pressure of the first condenser, the pressure of the first condenser is also lower. In other words, Example 1 reduces the condensing pressure of the first condenser, thus improving the condensation effect.

[0066] In Example 1, the heating water is heated in the first condenser and then enters the absorber for a second heating. Compared to Comparative Example 1, the outlet temperature of the first evaporator in Example 1 is higher, indicating a higher pressure in the first evaporator. Since the pressure in the absorber is approximately equal to that of the first evaporator, the pressure in the absorber in Example 1 is also higher, resulting in a higher temperature at which the solution evaporates within the absorber. Consequently, the heating water heated in the first condenser can be heated again in the absorber to reach a higher outlet temperature, leading to a higher outlet temperature for the lithium bromide chiller unit. In contrast, the absorber pressure in Comparative Example 1 is lower, requiring a lower temperature of the heating water entering the absorber for normal circulation. Therefore, in Comparative Example 1, the heating water needs to be heated in the absorber before entering the first condenser. Furthermore, the higher pressure and higher temperature of the solution within the absorber ensure that the solution concentration remains at a high level, preventing crystallization and facilitating the normal operation of the unit's circulation process.

[0067] As can be seen, in Example 1, the temperature of the high-temperature waste water entering the first evaporator is relatively high, while the temperature of the high-temperature waste water entering the generator is relatively low. Furthermore, the heating water is first heated by the heating heat pump unit I, so that the heating water first enters the first condenser for heating and then enters the absorber for heating, thereby increasing the outlet temperature of the heating water of the lithium bromide water heater unit.

[0068] The temperature and flow rate of high-temperature waste hot water and heating water at different locations in Example 1 and Comparative Example 1 were measured, and the thermal properties of the computer were analyzed. The specific results are shown in Tables 1-8. Figure 4 and Figure 5 The temperatures at different locations were marked according to the contents of Tables 1-8.

[0069] Table 1. Thermal conditions of the heating heat pump unit in Example 1

[0070] Group Evaporator inlet temperature (°C) Evaporator outlet temperature (°C) <![CDATA[Evaporator flow rate (m 3 / h)]]> Evaporator heat exchange (kW) Condenser inlet temperature (°C) Condenser outlet temperature (°C) <![CDATA[Condenser flow rate (m 3 / h)]]> Condenser heat exchange (kW) Power consumption (kW) Coefficient of performance (kW / kW) Heating heat pump unit II 37.3 28.5 174.7 1777.4 72 80 250.0 2326.0 548.6 4.24 Heating heat pump unit III 28.5 20.9 174.7 1553.0 65 72 250.0 2035.3 482.3 4.22 Heating heat pump unit I 20.9 9.9 174.7 2235.4 40 45.5 426.1 2725.6 490.2 5.56 total / / / 5565.7 / / / 7086.8 1521.1 4.61

[0071] Note: The total value of the heating performance coefficient in Table 1 refers to the comprehensive performance index of heating heat pump unit I, heating heat pump unit II and heating heat pump unit III.

[0072] Table 2 Thermal conditions of the heating heat pump unit in Comparative Example 1

[0073] Group Evaporator inlet temperature (°C) Evaporator outlet temperature (°C) <![CDATA[Evaporator flow rate (m 3 / h)]]> Evaporator heat exchange (kW) Condenser inlet temperature (°C) Condenser outlet temperature (°C) <![CDATA[Condenser flow rate (m 3 / h)]]> Condenser heat exchange (kW) Power consumption (kW) Coefficient of performance (kW / kW) Heating heat pump unit I 30.5 23.0 174.7 1514.5 75 82.4 250.0 2159.0 644.5 3.35 Heating heat pump unit II 23.0 15.9 174.7 1440.1 68 75 250.0 2035.3 595.1 3.42 Heating heat pump unit III 15.9 10.7 174.7 1055.5 63 68 250.0 1453.8 398.3 3.65 total / / / 4010.1 / / / 5648.1 1637.9 3.45

[0074] Note: The total value of the heating performance coefficient in Table 2 refers to the comprehensive performance index of heating heat pump unit I, heating heat pump unit II and heating heat pump unit III.

[0075] Table 3. Heat exchange data of the two heat exchangers in Example 1

[0076] Group Hot side inlet temperature (°C) Hot side outlet temperature (°C) <![CDATA[High-temperature waste hot water flow rate (m 3 / h)]]> Cold side inlet temperature (°C) Cold side outlet temperature (°C) <![CDATA[Heating water flow rate (m 3 / h)]]> Heat exchange (kW) First heat exchanger 115.0 105.0 174.7 80.0 87.0 250.0 2031.8 Second heat exchanger 89.8 50.0 174.7 45.5 85.0 176.1 8090.0 Temperature after mixing / / / / 86.2 / /

[0077] Table 4. Heat transfer data of the two heat exchangers in Comparative Example 1

[0078] Group Hot side inlet temperature (°C) Hot side outlet temperature (°C) <![CDATA[High-temperature residual hot water flow rate (m 3 / h)]]> Cold side inlet temperature (°C) Cold side outlet temperature (°C) <![CDATA[Heating water flow rate (m 3 / h)]]> Heat exchange (kW) Second heat exchanger 96.6 45.0 174.7 40.0 91.6 174.7 10486.4 Temperature after mixing / / / / 86.2 / /

[0079] Table 5. Thermal data of the lithium bromide water heater unit in Example 1

[0080] Group Inlet temperature (°C) Outlet temperature (°C) <![CDATA[Flow rate (m 3 / h)]]> Heat exchange (kW) First Evaporator 50.0 37.3 174.7 2585.0 First condenser 45.5 54.9 250.0 2733.1 generator 105.0 89.8 174.7 3084.7 absorber 54.9 65 250.0 2936.6

[0081] Table 6. Thermal data of the lithium bromide water heater unit in Comparative Example 1

[0082] Group Inlet temperature (°C) Outlet temperature (°C) <![CDATA[Flow rate (m 3 / h)]]> Heat exchange (kW) First Evaporator 45.0 30.5 174.7 2951.4 First condenser 52.3 63 250.0 3111.0 generator 115.0 96.6 174.7 3735.9 absorber 40.0 52.3 250.0 3576.2

[0083] Table 7. Thermodynamic data of the bromine-electrocoupling system in Example 1

[0084] Group Inlet temperature (°C) Outlet temperature (°C) <![CDATA[Flow rate (m 3 / h)]]> Heat exchange (kW) Heating water 40 86.2 426.1 22878.2 High-temperature waste water 115.0 9.9 174.7 21357.1 Unit power consumption / / / 1521.1 Thermal balance check / / / 0.0

[0085] Table 8. Thermodynamic data of the bromine-electrocoupling system in Comparative Example 1

[0086] Group Inlet temperature (°C) Outlet temperature (°C) <![CDATA[Flow rate (m 3 / h)]]> Heat exchange (kW) Heating water 40 86.2 424.7 22821.7 High-temperature waste water 115.0 10.7 174.7 21183.8 Unit power consumption / / / 1637.9 Thermal balance check / / / 0.0

[0087] As can be seen from Tables 1-8, compared with Comparative Example 1, the heating heat pump unit of Example 1 has a higher coefficient of performance (COP), and the lithium bromide water heater unit has a smaller heat exchange capacity. This results in a greater heat exchange between the heating hot water and the high-temperature waste hot water. Furthermore, while utilizing the outlet temperature of the heating water for heating, the outlet temperature of the high-temperature waste hot water is lower, making it suitable for cooling. Moreover, the unit consumes less electricity. Therefore, Example 1 makes more efficient use of the thermal energy of the high-temperature waste hot water, achieving both high-temperature heating and cooling functions, and the unit has higher energy efficiency.

Claims

1. A high-efficiency bromine electrocoupling system, characterized in that: It includes a lithium bromide hot water unit (1), a heating heat pump unit, a first heat exchanger (5), and a second heat exchanger (6); The lithium bromide hot water unit (1) includes an absorber (11), a generator (12), a first evaporator (13) and a first condenser (14); the inlet of the high-temperature waste hot water is connected in sequence to the hot side of the first heat exchanger (5), the generator (12), the hot side of the second heat exchanger (6) and the first evaporator (13); The heating heat pump unit includes heating heat pump unit I (2) and heating heat pump unit II (3). Heating heat pump unit I (2) includes a second evaporator (21), a second condenser (22) and a second compressor (23) connected to each other. Heating heat pump unit II (3) includes a third evaporator (31), a third condenser (32) and a third compressor connected to each other. The outlet of the first evaporator (13) is connected to the third evaporator (31) and the second evaporator (21) in sequence. The outlet of the second evaporator (21) is connected to the outlet of the high-temperature waste hot water. The inlet of the heating water is connected to the inlet of the second condenser (22). The outlet of the second condenser (22) is divided into two paths. One path is connected to the cold side inlet of the second heat exchanger (6), and the other path is connected to the cold side of the first condenser (14), the absorber (11), the third condenser (32), and the first heat exchanger (5) in sequence. The cold side outlet of the first heat exchanger (5) and the cold side outlet of the second heat exchanger (6) are connected to the outlet of the heating water through a pipeline.

2. The high-efficiency bromine electrocoupling system according to claim 1, characterized in that: The heating heat pump unit also includes heating heat pump unit III (4), which includes a fourth condenser (41), a fourth evaporator (42) and a fourth compressor. The fourth evaporator (42) is connected between the third evaporator (31) and the second evaporator (21). The fourth condenser (41) is connected between the absorber (11) and the third condenser (32). The fourth compressor is connected to the fourth evaporator (42) and the fourth condenser (41) respectively.

3. The high-efficiency bromine electrocoupling system according to claim 2, characterized in that: The heating heat pump unit III (4) includes at least one set of fourth condenser (41), fourth evaporator (42) and fourth compressor. The fourth condenser (41) of each set is connected in series, the fourth evaporator (42) of each set is connected in series, and the fourth compressor of each set is connected to the fourth evaporator (42) and fourth condenser (41) of the corresponding set respectively.

4. The high-efficiency bromine electrocoupling system according to claim 1, characterized in that: In the lithium bromide hot water unit (1), the high-temperature waste hot water enters the generator (12) and heats the dilute solution in the generator (12). Part of the refrigerant water in the dilute solution evaporates to form water vapor and concentrated solution. The water vapor enters the first condenser (14) to release heat and condense into water. The concentrated solution returns to the absorber (11). The refrigerant water in the first condenser (14) is throttled and then enters the first evaporator (13). The refrigerant water in the first evaporator (13) absorbs the heat from the high-temperature waste water and evaporates into water vapor. The unevaporated refrigerant water is circulated and sprayed by the refrigerant pump. The water vapor enters the absorber (11) and is absorbed by the concentrated solution in the absorber (11) to become a dilute solution. The dilute solution is transported to the generator (12). The concentrated solution transported from the generator (12) to the absorber (11) and the dilute solution transported from the absorber (11) to the generator (12) exchange heat through the solution heat exchanger (15). The heating water first enters the first condenser (14) to absorb the heat from the water vapor in the generator (12) to raise its temperature, and then enters the absorber (11) to absorb the heat from the water vapor in the first evaporator (13) to raise its temperature again.

5. The high-efficiency bromine electrocoupling system according to claim 3, characterized in that: The second compressor (23), the third compressor and the fourth compressor of the heating heat pump unit are centrifugal compressors.

6. The high-efficiency bromine electrocoupling system according to claim 1, characterized in that: The first heat exchanger (5) and the second heat exchanger (6) are plate heat exchangers.

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