Energy comprehensive utilization system of condensing heat recovery and lithium bromide refrigeration coupling

Abstract

The utility model discloses a kind of energy comprehensive utilization systems of condensing heat recovery and lithium bromide refrigeration coupling, including cooling module, condensing heat recovery module and lithium bromide refrigeration module.Cooling module includes refrigeration host and the coolant circulation pipeline connected with refrigeration host, condensing heat recovery module includes high-temperature heat recovery device integrated on coolant circulation pipeline and the high-temperature heat storage water tank connected with high-temperature heat recovery device, lithium bromide refrigeration module includes lithium bromide absorption refrigerating unit with hot water as driving heat source, the hot water outlet of high-temperature heat storage water tank is connected with lithium bromide absorption refrigerating unit, to provide hot water to lithium bromide absorption refrigerating unit.The utility model improves the low-grade waste heat of cooling module to high-grade useful energy and is used for refrigeration again, realizes the utmost cascade utilization of energy, reduces heat pollution, has good energy-saving, economic, environmental protection benefit, when cooling module uses cold storage module, also have powerful grid regulation green electricity consumption capacity.

Description

Technical Field

[0001] This utility model belongs to the field of energy system technology, and heat recovery involves refrigeration technology, particularly a comprehensive energy utilization system that couples condensation heat recovery with lithium bromide refrigeration. Background Technology

[0002] Lithium bromide absorption chillers can utilize industrial waste heat, solar energy, natural gas, and other heat sources to drive refrigeration, achieving heat-electricity-cooling conversion. However, their driving heat source temperature requirements are relatively high (>90℃ for single-effect chillers and >140℃ for double-effect chillers). If a high-temperature heat source is prepared solely to drive the lithium bromide chiller unit, it is not economically viable.

[0003] Condensation heat recovery technology is mostly used for preheating domestic hot water or low-temperature heating, but due to the low recovery temperature (usually <50℃), it cannot meet the demand for higher-grade heat energy (such as process heating, driving absorption chillers, etc.), thus limiting its application scenarios.

[0004] The large amount of medium- and low-temperature condensation heat (usually 30℃-45℃) generated by the refrigeration unit of a traditional cold storage system is usually directly discharged into the atmosphere, resulting in energy waste and thermal pollution.

[0005] Existing lithium bromide absorption chillers, condensation heat recovery technology, and traditional cold storage systems operate in isolation, resulting in significant drawbacks. Therefore, this invention proposes an energy utilization scheme that couples the aforementioned lithium bromide absorption chiller, condensation heat recovery technology, and traditional cold storage system. This not only overcomes the shortcomings of each system but also reduces thermal pollution and achieves multi-stage energy utilization. Utility Model Content

[0006] The purpose of this invention is to provide an energy integrated utilization system that couples condensation heat recovery with lithium bromide refrigeration. By organically coupling lithium bromide absorption chiller, condensation heat recovery technology and traditional cold storage system, it achieves multi-level energy utilization, reduces atmospheric heat pollution while avoiding energy waste, and improves the economic efficiency of lithium bromide absorption chiller, thereby solving the problems existing in the prior art.

[0007] To achieve the above objectives, this utility model provides the following solution: This utility model provides an energy integrated utilization system coupling condensation heat recovery and lithium bromide refrigeration, including a cooling module, a condensation heat recovery module, and a lithium bromide refrigeration module, wherein: The cooling module includes a refrigeration unit and a refrigerant circulation pipeline connected to the refrigeration unit. The condensation heat recovery module includes a high-temperature heat recovery device integrated into the refrigerant circulation pipeline and a high-temperature hot water storage tank connected to the high-temperature heat recovery device. The high-temperature heat recovery device can use the refrigeration waste heat carried by the refrigerant to heat the circulating water to ≥65°C and store it in the high-temperature hot water storage tank. The lithium bromide refrigeration module includes a lithium bromide absorption chiller unit with hot water as the driving heat source. The hot water outlet of the high-temperature hot water storage tank is connected to the driving heat source inlet of the lithium bromide absorption chiller unit to provide hot water to the lithium bromide absorption chiller unit. The cooling output terminals of both the cooling module and the lithium bromide refrigeration module are used to connect to the cooling terminal.

[0008] In some embodiments, the cooling module is a water source heat pump, a ground source heat pump, a sewage source heat pump, a seawater source heat pump, a screw chiller, or a water-cooled machine room. The cooling output terminal of the cooling module is connected in parallel with the cooling output terminal of the lithium bromide refrigeration module and then connected to the cooling terminal to supply cooling to the cooling terminal.

[0009] In some embodiments, the cooling module is an ice storage module or a water storage module. The cooling module also includes a cold storage tank for storing ice or water. The refrigeration unit is connected to the cold storage tank through a cooling circulation pipeline. The cold storage tank is connected to the cooling terminal as the cooling output terminal of the cooling module to supply cooling to the cooling terminal.

[0010] In some embodiments, the cooling module further includes a second cooling circulation pipeline, which is connected to the refrigeration unit, and a cooling tower is configured on the second cooling circulation pipeline.

[0011] In some embodiments, the energy integrated utilization system coupled with condensation heat recovery and lithium bromide refrigeration further includes a cooling terminal, which includes heat exchanger one, heat exchanger two, and a user terminal. The cooling output terminals of heat exchanger one and heat exchanger two are both connected to the user terminal. The heat exchanger is connected to the cold storage tank through a cold circulation pipeline, and the heat exchanger is able to output cold water at 1.5℃-5℃ to the user end. The second heat exchanger is connected to the lithium bromide refrigeration module through the third cold air circulation pipeline, and the second heat exchanger can output cold water at 10℃-12℃ to the user end.

[0012] In some implementations, the cooling output terminals of heat exchanger one and heat exchanger two are connected to the user terminal via a multi-way valve.

[0013] In some embodiments, the high-temperature heat recovery device is a shell-and-tube heat exchanger capable of producing hot water at 65°C-85°C.

[0014] In some embodiments, the lithium bromide refrigeration module further includes a cooling circulation pipeline four, which is connected to the lithium bromide absorption chiller unit, and a cooling tower two is configured on the cooling circulation pipeline four.

[0015] In some embodiments, the ice-cooling circulation pipeline, the first cooling circulation pipeline, the second cooling circulation pipeline, the third cooling circulation pipeline, the fourth cooling circulation pipeline, the cooling output terminal of the first heat exchanger, and the cooling output terminal of the second heat exchanger are all equipped with circulation pumps.

[0016] In some embodiments, the energy integrated utilization system coupled with condensation heat recovery and lithium bromide refrigeration further includes a coupling and control module, an electricity price monitoring component, and a building heating and cooling load monitoring component. The building heating and cooling load monitoring component can monitor the building's heating and cooling load, and the electricity price monitoring component can monitor the electricity price in the power system at different time periods. The coupling and control module is communicatively connected to the cooling module, the condensation heat recovery module, the lithium bromide refrigeration module, the electricity price monitoring component, and the building heating and cooling load monitoring component.

[0017] The present invention achieves the following technical advantages over the prior art: This invention proposes an energy integration system that couples condensation heat recovery with lithium bromide refrigeration. This innovative coupling process elevates the low-grade waste heat from the cooling module into high-grade usable energy for reuse in refrigeration, achieving optimal energy utilization. This reduces atmospheric heat pollution and offers significant energy-saving, economic, and environmental benefits. When the cooling module uses ice storage or water storage, it also possesses strong grid regulation and green electricity absorption capabilities. During peak daytime electricity hours or peak cooling load demand, the stored high-temperature hot water is prioritized to drive the lithium bromide refrigeration module. Depending on the cooling load demand, the cooling module can be activated for ice melting, enabling simultaneous cooling from both the cooling module and the lithium bromide refrigeration module. This diverse and flexible cooling mode can meet the varied needs of users.

[0018] The specific beneficial effects of this utility model are as follows: (i) This utility model limits the cooling module to an ice storage module, which can make full use of off-peak electricity to make ice and store cold, reducing electricity costs and energy consumption; at the same time, it uses waste heat to drive the lithium bromide refrigeration module to refrigerate, which can significantly reduce the power consumption of electric refrigeration during peak electricity hours during the day, significantly shorten the investment payback period, and has strong economic benefits.

[0019] (ii) The energy comprehensive utilization system of this utility model reduces atmospheric thermal pollution and indirectly reduces the emission of a large amount of greenhouse gases and pollutants such as CO2 and SO2 through electricity saving, which is conducive to energy conservation and environmental protection.

[0020] (iii) Dual peak shifting and valley filling (nighttime cold and heat storage, daytime use) enriches the application scenarios, greatly enhances the grid regulation capability, and provides space for the access of intermittent new energy sources such as wind power and photovoltaics.

[0021] (iv) It has two cooling systems: ice storage and heat-driven refrigeration, ensuring a strong energy supply and allowing for flexible selection of operating strategies based on electricity prices and load. The system boasts high reliability and flexibility. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the integrated energy utilization system of condensation heat recovery and lithium bromide refrigeration coupling disclosed in Embodiment 1 of this utility model (the cooling module adopts an ice storage module). Figure 2 This is a flowchart illustrating the working process of the energy integrated utilization system coupled with condensation heat recovery and lithium bromide refrigeration as disclosed in Embodiment 1 of this utility model. Figure 3 This is a schematic diagram of the integrated energy utilization system of condensation heat recovery and lithium bromide refrigeration coupling disclosed in Embodiment 2 of this utility model (the cooling module adopts a traditional refrigeration module). Figure 4 This is a schematic diagram of the integrated energy utilization system (with coupling and control modules) disclosed in Embodiment 3 of this utility model, which is a condensation heat recovery and lithium bromide refrigeration coupling system.

[0024] In the figure, the attached label is: 100 - Integrated energy utilization system coupled with condensation heat recovery and lithium bromide refrigeration; 11-Refrigeration unit; 12-Refrigerant circulation piping; 13-Cooling circulation piping one; 14-Cooling circulation piping two; 15-Cooling tower one; 16-Cold storage ice tank; 21-High-temperature heat recovery device; 22-High-temperature hot water storage tank; 23-Hot water circulation pipeline; 3-Lithium bromide refrigeration module; 31-Cooling circulation pipeline three; 32-Cooling circulation pipeline four; 33-Cooling tower two; 41-Heat exchanger one; 42-Heat exchanger two; 43-Multi-way valve; 44-User end; 5-Coupling and Control Module; 6-Building heating and cooling load monitoring components; 7-Electricity price monitoring component; ①②③④⑤⑥⑦⑧ represent the circulation paths of hot and cold energy within the system. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] The purpose of this invention is to provide an energy integrated utilization system that couples condensation heat recovery with lithium bromide refrigeration. By organically coupling lithium bromide absorption chiller, condensation heat recovery technology and traditional cold storage system, it achieves multi-level energy utilization, avoids energy waste and reduces atmospheric heat pollution, and improves the economic efficiency of lithium bromide absorption chiller, thereby solving the problems existing in the prior art.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1 like Figure 1 As shown, this utility model provides an energy integrated utilization system 100 that couples condensation heat recovery with lithium bromide refrigeration, mainly including a cooling module, a condensation heat recovery module and a lithium bromide refrigeration module 3. The cooling module includes a refrigeration unit 11 and a refrigerant circulation pipeline 12 connected to the refrigeration unit 11; the condensation heat recovery module includes a high-temperature heat recovery device 21 integrated on the refrigerant circulation pipeline 12 and a high-temperature hot water storage tank 22 connected to the high-temperature heat recovery device 21. The high-temperature heat recovery device 21 can use the refrigeration waste heat carried by the refrigerant on the refrigerant circulation pipeline 12 to heat the circulating water to ≥65℃ and store it in the high-temperature hot water storage tank 22; the lithium bromide refrigeration module 3 includes a lithium bromide absorption chiller unit with hot water as the driving heat source. The hot water outlet of the high-temperature hot water storage tank 22 is connected to the driving heat source inlet of the lithium bromide absorption chiller unit to provide hot water to the lithium bromide absorption chiller unit. At the same time, the driving heat source outlet of the lithium bromide absorption chiller unit is connected to the return water outlet of the high-temperature hot water storage tank 22 to form a hot water circulation pipeline 23 between the high-temperature hot water storage tank 22 and the lithium bromide absorption chiller unit. The cooling output terminals of both the cooling module and the lithium bromide refrigeration module 3 are connected to the cooling terminal.

[0029] In some feasible implementations, the cooling module is a cold storage unit such as an ice storage module or a water-based cold storage module. In this case, the cooling module also includes a cold storage tank for storing ice or water. Taking an ice storage module as an example, its cold storage tank is a cold storage ice tank 16 for storing ice. Figure 1 and Figure 2 As shown, the refrigeration unit 11 is connected to the cold storage ice tank 16 via the cooling circulation pipeline 13. The cold storage ice tank 16 serves as the cooling capacity output terminal of the cooling module and is connected to the cooling terminal to supply cooling. Specifically, the refrigeration unit 11 can be a dual-mode screw chiller or centrifugal chiller, with an outlet water temperature of -6℃ in ice-making mode. The cold storage ice tank 16 is preferably a coil-type ice storage tank or a dynamic ice slurry cold storage tank.

[0030] In some feasible implementations, the cooling module may also include a second cooling circulation pipe 14, which is connected to the ice storage chiller. A cooling tower 15 is installed on the second cooling circulation pipe 14 to dissipate heat for the chiller 11.

[0031] In some feasible implementations, the cooling terminal specifically includes heat exchanger 1 41, heat exchanger 2 41, and user terminal 44. The cooling output terminals of heat exchanger 1 41 and heat exchanger 2 41 are both connected to user terminal 44. User terminal 44 includes, but is not limited to, buildings such as shopping malls and residences. Heat exchanger 1 41 is connected to the ice storage tank 16 of the cooling module through an ice circulation pipeline. After the circulating water in heat exchanger 1 41 is cooled by heat exchange, it can obtain low-temperature cold water of 1.5℃-5℃. Heat exchanger 2 41 is connected to the lithium bromide refrigeration module 3 through a cooling circulation pipeline 3. After the circulating water in heat exchanger 2 41 is cooled by heat exchange, it can obtain cold water of 10℃-12℃.

[0032] In some feasible implementations, heat exchanger 1 41 and heat exchanger 2 41 include, but are not limited to, plate heat exchangers.

[0033] In some feasible implementations, to improve the system's operational flexibility, the cooling output terminals of heat exchanger 1 41 and heat exchanger 2 41 can be connected to the user terminal 44 via valves. Heat exchanger 1 41 and heat exchanger 2 41 can supply cooling independently or simultaneously in combination to supply cooling to the user terminal 44. When the cooling capacity of the lithium bromide refrigeration module 3 (i.e., the cooling capacity output by heat exchanger 2 41) cannot meet the needs of the user terminal 44, a combined cooling method can be adopted, utilizing the lower temperature cooling capacity of the ice tank in the cooling module to neutralize the cooling capacity temperature of the lithium bromide refrigeration module 3, thereby obtaining a lower cooling capacity to meet the cooling needs of the user terminal 44.

[0034] Furthermore, to improve the structural integration of the system, it is preferable that the cooling output ends of heat exchanger 1 41 and heat exchanger 2 41 are connected to the user terminal 44 through the same multi-way valve 43. The multi-way valve 43 is preferably a three-way valve. The cooling output ends of heat exchanger 1 41, heat exchanger 2 41, and user terminal 44 are respectively connected to the three valve ports of the three-way valve. By controlling the three-way valve, according to the cooling demand of user terminal 44, at least one of the cooling output ends of heat exchanger 1 41 and heat exchanger 2 41 can be connected to user terminal 44, realizing multi-mode cooling of user terminal 44 and meeting different cooling needs. When the user terminal 44 is simultaneously connected to the cooling output terminals of heat exchanger 1 41 and heat exchanger 2 41, the ice melting and cooling of the cooling module and the cooling of the lithium bromide absorption chiller are operating simultaneously. The two cooling systems are first fused at the three-way valve before entering the user terminal 44. The low-temperature chilled water of 1℃-4℃ generated by the cooling module is mixed with the chilled water of 10℃-12℃ generated by the lithium bromide absorption chiller to obtain chilled water of about 7℃, which is used to cool the user terminal 44.

[0035] In some other implementations, the cooling module can also be a water-based cold storage module, which employs a water-based cold storage mechanism, while the aforementioned ice storage module employs an ice-based cold storage mechanism. Compared to the water-based cold storage module, the ice-based cold storage mechanism is characterized by: trading higher nighttime power consumption and more complex equipment for a very small footprint and maximum power savings during peak hours. Water-based cold storage chillers, on the other hand, emphasize: trading a large footprint for a simpler system, relatively lower initial investment, and high nighttime cooling efficiency. The core trade-off between ice-based and water-based cold storage chillers lies in "space" and "efficiency." Ice-based cold storage has a smaller footprint but lower cooling temperatures and lower efficiency; for every degree Celsius decrease in cooling temperature, efficiency decreases by about 3%. The advantage of ice-based cold storage over water-based cold storage is that its footprint is about 1 / 7 that of water-based cold storage, making it much smaller.

[0036] Furthermore, ice storage can provide chilled water at temperatures ranging from 1.5°C to 5°C, while water storage can only provide chilled water at a minimum of 4°C or higher. Therefore, by using the 1.5°C-5°C chilled water produced by ice storage to mix with the chilled water produced by a lithium bromide absorption chiller, the lithium bromide absorption chiller only needs to produce chilled water at 10°C-12°C to obtain the user's required 0°C-12°C chilled water. This allows the lithium bromide absorption chiller's outlet water temperature to be higher than the conventional outlet water temperature (for example, the outlet water temperature of the lithium bromide absorption chiller when supplying chilled water to the user solely through the lithium bromide absorption chiller). For every 1°C increase in the outlet water temperature of the lithium bromide absorption chiller, the unit efficiency increases by approximately 3%. This coupling of the lithium bromide absorption chiller and ice storage achieves complementary efficiency; that is, the increased efficiency of the lithium bromide absorption chiller compensates for the lower efficiency of ice storage.

[0037] Meanwhile, the low-temperature chilled water of 1.5℃-5℃ produced by ice storage can be mixed with the chilled water of 10℃-12℃ produced by the lithium bromide absorption chiller to produce chilled water of about 7℃, which is exactly the optimal water temperature for terminal cooling, thus improving the stability, reliability and satisfaction of terminal cooling.

[0038] The waste heat generated by the ice storage module's refrigeration is converted into hot water, reducing heat emissions and pollution caused by direct waste heat discharge. Simultaneously, the hot water drives a lithium bromide absorption chiller unit for refrigeration. Compared to the independent operation of existing chiller units, this reduces building cooling energy consumption, lowers building cooling emissions, and reduces building cooling operating costs. The entire energy utilization system achieves significant reductions in initial investment and operating costs, while also substantially saving energy and reducing emissions, thus realizing cost reduction and efficiency improvement, and contributing to building carbon neutrality and development. Furthermore, ice storage can also facilitate peak electricity demand shifting and valley filling, absorbing green electricity, alleviating peak urban electricity loads during peak summer seasons, helping to ensure grid security, and reducing grid investment in power generation and distribution.

[0039] Through practical verification, the energy integrated utilization system based on the ice storage cooling mechanism for nighttime electricity consumption in this embodiment can reduce building cooling energy consumption by more than 50% compared to the independent operation of existing conventional refrigeration systems, reduce building cooling emissions by about 50%, and reduce operating costs by about 50%.

[0040] While storing cold (ice), the refrigeration unit 11 of the cooling module also generates approximately 30% heat energy due to the mechanical operation of the compressor. In traditional applications, this heat energy is dissipated along with the waste heat generated by the refrigeration unit 11 through the cooling tower 15. However, in this embodiment, by recovering and utilizing the waste heat from the cooling module, the mechanical heat energy of the compressor is also recovered. This is equivalent to increasing the waste heat recovery of the cooling module by another 30%, which is equivalent to using 130% of the heat energy to power the condensing heat recovery module to produce hot water, which then drives the lithium bromide absorption chiller unit to achieve a cooling efficiency of over 80%.

[0041] In some feasible implementations, the lithium bromide absorption chiller unit includes, but is not limited to, using a single-effect or low-pressure double-effect lithium bromide absorption chiller. In this embodiment, the lithium bromide absorption chiller unit can perform internal cooling using medium-temperature heat of 60℃-85℃, which is crucial for the reliable operation of the integrated energy utilization system 100 that couples condensation heat recovery with lithium bromide refrigeration.

[0042] In some feasible implementations, the hot water outlet of the high-temperature hot water storage tank 22 can also be equipped with a user-end water supply pipe to supply heat to the user end. The user end connected to the hot water outlet of the high-temperature hot water storage tank 22 includes, but is not limited to, domestic hot water pipe network or heating pipe network.

[0043] In some feasible implementations, the high-temperature heat recovery device 21 includes, but is not limited to, using a shell-and-tube heat exchanger that can produce hot water at 65°C-85°C.

[0044] In some feasible implementations, the shell-and-tube heat exchanger and the condenser of the refrigeration unit 11 are integrated into one unit to improve the structural integration of the system and simplify the system piping layout.

[0045] In some feasible implementations, the high-temperature hot water storage tank 22 is preferably a pressure-bearing insulated water tank with an insulation layer thickness of ≥100mm.

[0046] In some feasible implementations, the lithium bromide refrigeration module 3 may include a cooling circulation pipeline 32 in addition to the cooling circulation pipeline 31. The cooling circulation pipeline 32 is connected to the lithium bromide absorption chiller unit and a cooling tower 33 is configured on the cooling circulation pipeline 32. The cooling tower 33 can dissipate heat for the unit.

[0047] It should be noted that circulating pumps are installed along each of the above-mentioned circulating water paths to ensure the normal operation of the system. Specifically, circulating pumps are installed in the ice-cold circulating pipeline, cooling circulating pipeline one, cooling circulating pipeline two, cooling circulating pipeline three, cooling circulating pipeline four, the cooling output end of heat exchanger one 41, and the cooling output end of heat exchanger two 42.

[0048] The aforementioned integrated energy utilization system 100, which couples condensation heat recovery with lithium bromide refrigeration, is generally configured with a coupling and control module 5. This module can intelligently control the automated coordinated operation of the cooling module, condensation heat recovery module, and lithium bromide refrigeration module 3, and adjust the operating status of the multi-way valve according to user needs. The control strategy is as follows: During off-peak electricity hours at night, the control system executes the energy storage mode, starts the refrigeration unit 11 of the cooling module (ice storage module) to run ice-making mode, and stores cold energy in the cooling module through ice-making and cold storage; at the same time, the condensation heat recovery module recovers the condensation waste heat generated during the operation of the refrigeration unit 11 to prepare high-temperature hot water of ≥65℃ (generally 65℃-85℃ hot water) and stores it in the high-temperature hot water storage tank 22. During peak electricity price periods or periods of high cooling load demand, the high-temperature hot water stored in the high-temperature hot water storage tank 22 is used first to drive the lithium bromide absorption chiller unit, allowing the lithium bromide refrigeration module to provide cooling independently. When the cooling capacity of the lithium bromide absorption chiller unit cannot meet the cooling load demand of the user 44, the cooling module (ice storage module) is controlled to melt ice for cooling, achieving simultaneous cooling by the cooling module (ice storage module) and the lithium bromide refrigeration module. Cooling is provided according to cooling load demand, offering diverse and flexible cooling modes to meet the diverse needs of the user.

[0049] The following is combined Figure 2The operating principle and flow of the above-mentioned integrated energy utilization system 100, which couples condensation heat recovery with lithium bromide refrigeration, are explained in detail below: Cycle ①: The cooling water from the refrigeration unit 11 is pumped to the high-temperature heat recovery device 21. After heat exchange in the high-temperature heat recovery device 21, the heated cooling water flows back to the condenser of the refrigeration unit 11. It should be noted that the refrigeration unit 11 and the cold storage ice tank 16 used in the cooling module of this embodiment are both existing technologies, and their specific structures and working principles will not be described in detail here.

[0050] ② Cycle: The high-temperature hot water storage tank 22 is already full of hot water through the high-temperature heat recovery device 21, so the excess cooling water of the refrigeration unit 11 is circulated through the cooling tower 15.

[0051] Cycle ③: The compressor of the refrigeration unit 11 compresses the refrigerant (also called "coolant") and it exits from the condenser to exchange heat with the ice storage tank 16 to make ice. After heat exchange in the ice storage tank 16, the refrigerant returns to the refrigeration unit 11 through the evaporator. The evaporator, compressor, etc. are conventional components of the refrigeration unit 11, and their specific structure and working principle will not be described in detail here.

[0052] Circulation ④: The hot water in the high-temperature hot water storage tank 22 is pumped to the lithium bromide absorption chiller to heat the dilute lithium bromide solution, using approximately 10 degrees of heat. The return water temperature is 55℃-70℃.

[0053] Circulation ⑤: Cooling water produced by the lithium bromide absorption chiller is circulated to cooling tower 2, 33 for heat dissipation.

[0054] Cycle ⑥: Cooling water at 10°C produced by the lithium bromide absorption chiller is returned at approximately 15°C after heat exchange in heat exchanger 241.

[0055] ⑦ Circulation: The cold storage ice tank 16 cools the water by 1.5℃-5℃, and after heat exchange by heat exchanger 41, it yields return water at 6℃-11℃.

[0056] ⑧ Circulation: User-end 44 uses cold circulation, generally using cold water at around 7℃, and returning water at around 14℃ after heat exchange.

[0057] As described above, the energy integrated utilization system 100 of this scheme, which couples condensation heat recovery with lithium bromide refrigeration, adopts an innovative coupling to upgrade low-grade waste heat into high-grade usable energy and reuse it for refrigeration. This achieves the ultimate cascade utilization of energy, reduces thermal pollution, and has good energy-saving, economic, and environmental benefits, as well as a strong grid regulation and green electricity absorption capacity. During peak daytime power hours or peak cooling load demand, the stored high-temperature hot water is used first to drive the lithium bromide refrigeration module for cooling. Depending on the cooling load demand, the ice storage device is activated to melt ice for cooling as a supplement to the cooling provided by the lithium bromide refrigeration module. Both provide cooling in a variety of flexible modes, which can meet the diverse needs of users 44.

[0058] When the cooling module uses a water storage cooling module, Figure 1 and Figure 2 The ice storage tank 16 in the middle can be replaced with a water storage tank. The layout structure and cooling principle are the same as the system based on the ice storage mechanism mentioned above, and will not be described again here.

[0059] The specific beneficial effects of this plan are as follows: (i) This solution limits the cooling module to an ice storage module, which can make full use of off-peak electricity to make ice and store cold, reducing electricity costs and energy consumption; at the same time, it uses waste heat to drive the lithium bromide refrigeration module 3 for refrigeration, which can significantly reduce the power consumption of electric refrigeration during peak electricity hours during the day, significantly shorten the investment payback period, and has strong economic benefits.

[0060] (ii) The energy integrated utilization system of this plan reduces atmospheric thermal pollution by reducing emissions through condensation heat, and indirectly reduces the emissions of greenhouse gases and pollutants such as CO2 and SO2 by saving electricity, which is conducive to energy conservation and environmental protection.

[0061] (iii) Dual peak shifting and valley filling (nighttime cold and heat storage, daytime use) greatly enhances the grid regulation capability and provides space for the access of intermittent new energy sources such as wind power and photovoltaics.

[0062] (iv) It has two cooling systems: ice storage and heat-driven refrigeration, ensuring a strong energy supply and allowing for flexible selection of operating strategies based on electricity prices and load. The system boasts high reliability and flexibility.

[0063] In practical applications, in addition to the aforementioned cooling modules that can store cold (ice), the system proposed in this solution can also recover waste heat from application scenarios such as water source heat pumps, ground source heat pumps, sewage source heat pumps, seawater source heat pumps, ordinary screw compressors, centrifugal compressors with cooling towers, and water-cooled machine rooms, to provide hot water energy for cooling to lithium bromide absorption chillers.

[0064] Example 2 like Figure 3 As shown, this embodiment proposes an energy integrated utilization system 100 that couples condensation heat recovery with lithium bromide refrigeration. The difference between this system and Embodiment 1 lies only in that the cooling module uses a traditional refrigeration module. Traditional refrigeration modules include, but are not limited to, water source heat pumps, ground source heat pumps, sewage source heat pumps, seawater source heat pumps, ordinary screw chillers, and water-cooled machine rooms with centrifugal chillers and cooling towers. Waste heat from these application scenarios is recovered, and it can also provide hot water energy for the lithium bromide absorption chiller unit for cooling. It should be noted that when the cooling module uses a traditional refrigeration module, its output cooling capacity needs to be combined with the output cooling capacity of the lithium bromide absorption chiller unit before being discharged into the cooling terminal.

[0065] Traditional refrigeration modules do not store cold (ice). Instead, they recover waste heat from refrigeration into a high-temperature hot water storage tank 22 during the direct cooling process. The cooling capacity obtained from condensation is directly combined with the output cooling capacity of the lithium bromide absorption chiller and then discharged into the cooling terminal.

[0066] like Figure 3 As shown, compared to Example 1, the energy integrated utilization system 100 of this embodiment, which couples condensation heat recovery with lithium bromide refrigeration, merges circulation paths ③ and ⑦, or in other words, eliminates path ③. Compared to Example 1, except that the system no longer has additional grid regulation capabilities, the energy cascade utilization principle and cost reduction and efficiency improvement effect of the entire system are basically the same as those of Example 1, and will not be repeated here.

[0067] Example 3 like Figure 4 As shown, this embodiment proposes an energy integrated utilization system 100 that couples condensation heat recovery with lithium bromide refrigeration. Based on embodiment 1, it also includes a coupling and control module 5. The coupling and control module 5 is communicatively connected to the cooling module, the condensation heat recovery module, and the lithium bromide refrigeration module 3 to intelligently control the coordinated operation of these modules.

[0068] In some feasible implementations, the integrated energy utilization system 100 coupling condensation heat recovery and lithium bromide refrigeration also includes a building heating and cooling load monitoring component 6. This component 6 is communicatively connected to the coupling and control module 5, enabling real-time monitoring of the building heating and cooling load and transmitting monitoring data to the coupling and control module 5. This facilitates the coupling and control module 5 in dynamically optimizing the ice storage capacity of the ice storage device, the water storage capacity of the high-temperature hot water storage tank 22, and the start-up, shutdown, and output of the lithium bromide absorption chiller, ensuring the system operates at its optimal state. The building heating and cooling load monitoring component 6 may include, but is not limited to, the use of temperature sensors.

[0069] In some feasible implementations, the coupling and control module 5 can be configured with an electricity price monitoring component 7. This component 7 can monitor electricity prices in the power system at different times in real time and provide real-time feedback to the coupling and control module 5. The coupling and control module 5 can coordinate with building heating and cooling loads and electricity price signals to dynamically optimize the ice storage capacity of the ice storage device, the water storage capacity of the high-temperature hot water storage tank 22, and the start-up, shutdown, and output of the lithium bromide absorption chiller, thereby improving the reliability of the system's intelligent operation. The electricity price monitoring component 7 may include, but is not limited to, a peak-valley electricity time controller.

[0070] Coupling and control module 5 can adopt a mature PLC intelligent control system, and the control strategy mainly includes: Real-time monitoring of peak-valley-flat electricity price signals and electricity price signals during periods of wind and solar power curtailment; Predict the building's cooling and heating load curves for the next day; And real-time monitoring system for ice and water storage.

[0071] By optimizing calculations and dynamically deciding on the total nighttime energy storage and the daytime power distribution among ice, heat, and lithium bromide, the lowest operating cost throughout the entire life cycle can be achieved.

[0072] This solution integrates and controls ice storage, high-temperature condensation heat recovery, and lithium bromide absorption refrigeration across systems. It elevates the waste heat from the ice storage system into high-grade thermal energy (≥65℃), which drives the lithium bromide chiller, achieving a "secondary conversion" of cooling capacity. This significantly improves the overall energy efficiency of the system and enhances the grid's peak-shaving and valley-filling capabilities. It truly achieves a single energy input that simultaneously meets multiple needs for cooling, heating, and electricity, making it suitable for buildings and industrial applications requiring both cooling and heating.

[0073] Example 4 In northern regions where heating is needed in winter and cooling in summer, there is usually a centralized heating network covered by combined heat and power (CHP). In this case, the lithium bromide unit in Example 1 can be replaced with a dual-effect cooling and heating type lithium bromide unit and connected to the centralized heating network. During the winter heating season in northern regions, the dual-effect cooling and heating type lithium bromide unit can provide heat energy to the centralized heating network, heating the circulating return water in the network and raising the temperature for heating. The advantages are: lowering the water temperature of the centralized heating return water network can improve the power generation efficiency of the CHP generator unit, and it does not increase the heat supply to the centralized heating network's water supply pipes, approaching zero-carbon heating. The dual-effect cooling and heating type lithium bromide unit can be used in both winter and summer, eliminating the need for repeated purchases. It provides near-zero-carbon heating in winter and, during summer cooling, possesses the aforementioned energy-saving benefits, saving more than 50% of cooling energy consumption. Furthermore, since the cooling module can store energy (cold), it can also use green electricity to drive the chiller, so it also provides near-zero-carbon cooling in summer, making it energy-saving and environmentally friendly.

[0074] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0075] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An energy integrated utilization system coupling condensation heat recovery and lithium bromide refrigeration, characterized in that, It includes a cooling module, a condensation heat recovery module, and a lithium bromide refrigeration module, among which: The cooling module includes a refrigeration unit and a refrigerant circulation pipeline connected to the refrigeration unit. The condensation heat recovery module includes a high-temperature heat recovery device integrated into the refrigerant circulation pipeline and a high-temperature hot water storage tank connected to the high-temperature heat recovery device. The high-temperature heat recovery device can use the refrigeration waste heat carried by the refrigerant to heat the circulating water to ≥65℃ and store it in the high-temperature hot water storage tank. The high-temperature hot water storage tank is a pressurized and insulated water tank with an insulation layer thickness of ≥100mm. The lithium bromide refrigeration module includes a lithium bromide absorption chiller unit with hot water as the driving heat source. The hot water outlet of the high-temperature hot water storage tank is connected to the driving heat source inlet of the lithium bromide absorption chiller unit to provide hot water to the lithium bromide absorption chiller unit. The cooling output terminals of both the cooling module and the lithium bromide refrigeration module are used to connect to the cooling terminal.

2. The energy comprehensive utilization system coupled with condensation heat recovery and lithium bromide refrigeration according to claim 1, characterized in that, The cooling module is a water source heat pump, ground source heat pump, sewage source heat pump, seawater source heat pump, screw chiller or water-cooled machine room. The cooling output terminal of the cooling module is connected in parallel with the cooling output terminal of the lithium bromide refrigeration module and then connected to the cooling terminal to supply cooling to the cooling terminal.

3. The comprehensive energy utilization system coupled with condensation heat recovery and lithium bromide refrigeration according to claim 1, characterized in that, The cooling module is an ice storage module or a water storage module. The cooling module also includes a cold storage tank for storing ice or water. The refrigeration unit is connected to the cold storage tank through a cooling circulation pipeline. The cold storage tank is connected to the cooling terminal as the cooling output terminal of the cooling module to supply cooling to the cooling terminal.

4. The energy comprehensive utilization system coupled with condensation heat recovery and lithium bromide refrigeration according to claim 3, characterized in that, The cooling module also includes a second cooling circulation pipeline, which is connected to the refrigeration unit and is equipped with a first cooling tower.

5. The energy comprehensive utilization system coupled with condensation heat recovery and lithium bromide refrigeration according to claim 4, characterized in that, It also includes a cooling terminal, which includes a heat exchanger, a heat exchanger, and a user terminal. The cooling output terminals of the heat exchanger and the heat exchanger are both connected to the user terminal. The heat exchanger is connected to the cold storage tank through a cold circulation pipeline, and the heat exchanger is able to output cold water at 1.5℃-5℃ to the user end. The second heat exchanger is connected to the lithium bromide refrigeration module through the third cooling circulation pipeline, and the second heat exchanger can output cold water at 10℃-12℃ to the user end.

6. The energy comprehensive utilization system coupled with condensation heat recovery and lithium bromide refrigeration according to claim 5, characterized in that, The cooling output terminals of heat exchanger one and heat exchanger two are connected to the user terminal via multi-way valves.

7. The comprehensive energy utilization system coupled with condensation heat recovery and lithium bromide refrigeration according to claim 2, characterized in that, The high-temperature heat recovery device is a shell-and-tube heat exchanger that can produce hot water at 65℃-85℃.

8. The energy comprehensive utilization system coupled with condensation heat recovery and lithium bromide refrigeration according to claim 5, characterized in that, The lithium bromide refrigeration module also includes a fourth cooling circulation pipeline, which is connected to the lithium bromide absorption chiller unit and is equipped with a second cooling tower.

9. The energy comprehensive utilization system coupled with condensation heat recovery and lithium bromide refrigeration according to claim 8, characterized in that, The ice-cooling circulation pipeline, the first cooling circulation pipeline, the second cooling circulation pipeline, the third cooling circulation pipeline, the fourth cooling circulation pipeline, the cold output end of the first heat exchanger, and the cold output end of the second heat exchanger are all equipped with circulation pumps.

10. The energy comprehensive utilization system coupled with condensation heat recovery and lithium bromide refrigeration according to any one of claims 1-9, characterized in that, It also includes a coupling and control module, an electricity price monitoring component, and a building heating and cooling load monitoring component. The building heating and cooling load monitoring component can monitor the building's heating and cooling load, and the electricity price monitoring component can monitor the electricity price in the power system at different time periods. The coupling and control module is communicatively connected to the cooling module, the condensation heat recovery module, the lithium bromide refrigeration module, the electricity price monitoring component, and the building heating and cooling load monitoring component.

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