Waste heat recycling and central heating and cooling system

Abstract

The utility model provides a waste heat recycling and central heating and cooling system which comprises a first cooling and heating unit, a second cooling and heating unit, a third cooling and heating unit, a fourth cooling and heating unit and a fourth cooling and heating unit, and the first cooling and heating unit comprises a compression heat pump unit, a water segregator, a heating and ventilation water supply pipe network and a water collector. The compression type heat pump unit conveys water absorbing heat of the water source to the heating and ventilation water supply pipe network through the water segregator, and the water returns to the water collector and then returns to the compression type heat pump unit for control circulation; and the second cooling and heating unit comprises a centralized energy station, an absorption heat pump unit and a water tank which are communicated in sequence, so that the cooled steam received by the nuclear power unit is sent to the centralized energy station and then is connected to a generator interface of the absorption heat pump unit. According to the utility model, the nuclear power warm discharged water waste heat is effectively utilized to realize the triple-generation service of central heating, cooling and sanitary hot water for nuclear power plant areas, living quarters and adjacent green-energy small towns.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power waste heat recovery, in particular to a waste heat recycling and centralized heating and cooling system. Background Art

[0002] Nuclear power units have lower steam parameters than conventional thermal power units. Under the same power generation capacity, the required amount of steam is large. The waste heat discharged is more than 1.5 times the heat of circulating water cooling in conventional power plants. About 63% of the heat of nuclear power plants is discharged into the nearby seawater in the form of low-grade waste heat. The design discharge temperature of circulating cooling water of nuclear power units is about 8.0℃. If it is discharged into the nearby sea, it will exchange heat with seawater and atmosphere, causing the seawater temperature in the discharge area to rise. With the rising and falling tides of seawater, it will be discharged to the surrounding sea areas, and then heat will be exchanged with the atmosphere through seawater. The warm discharge of wastewater during the operation of nuclear power plants will cause the water temperature in local sea areas to rise, forming a "heat island" and affecting the regional marine ecological balance. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of the utility model is to provide a waste heat recycling and centralized heating and cooling system, which is used to solve the problem that the steam parameters of nuclear power units in the prior art are relatively low. Under the same power generation capacity, the required steam volume is large, and the discharged waste heat is several times the circulating cooling volume of conventional power plants. The required circulating water volume and the discharge area capacity are very large. If it is discharged into the sea, it will exchange heat with seawater and the atmosphere, so that the seawater temperature in the drainage area will rise. When the tide is high, it will be discharged to a distant area with the tide. When the tide is low, it will be discharged along the axis of the drainage jet for a certain distance. The remaining heat will exchange heat with the atmosphere, and the water temperature will be reduced. A small amount of waste heat will be discharged into the open sea. As the operation time of the nuclear power plant increases, the water temperature in the local sea area will rise, forming a "heat island", accelerating the growth rate of aquatic organisms and algae, and affecting the ecological balance.

[0004] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a waste heat recycling and centralized heating and cooling system, including: a first cooling and heating unit, the first cooling and heating unit including a compression heat pump unit, a water distributor, a HVAC water supply network and a water collector connected in sequence; a water source to be recovered from waste heat is pumped to the compression heat pump unit for corresponding temperature adjustment, the compression heat pump unit sends the water after absorbing the heat of the water source to the HVAC water supply network through the water distributor, and returns the water to the water collector and then returns to the compression heat pump unit for controlled circulation; and a second cooling and heating unit, which includes a centralized energy station, an absorption heat pump unit and a water tank which are connected in sequence, so as to send the steam received from the nuclear power unit and after being cooled to the centralized energy station, and then connect it to the generator interface of the absorption heat pump unit, and return it to the water tank through the absorption heat pump unit after providing thermal energy; and a hot water supply unit, which includes: a heat recovery heat pump unit and a domestic hot water tank, so as to obtain hot water by exchanging warm wastewater through the heat recovery heat pump unit, and pump it to the domestic hot water tank for storage.

[0005] In one embodiment of the utility model, the first cooling and heating unit also includes: a low-temperature heat source circulation pump and a first water pump, the output end of the low-temperature heat source circulation pump is connected to the input end of the compression heat pump unit, and the input end of the low-temperature heat source circulation pump is connected to the warm drainage interface of the nuclear power unit, so that the warm drainage of the nuclear power unit is pumped to the compression heat pump unit in the office area through the low-temperature heat source circulation pump, and then returned to the sea through the corresponding outlet end of the compression heat pump unit. The compression heat pump unit absorbs the hot water from the warm drainage and sends it to the HVAC water supply network of the office area and the living area through the water distributor, and after the HVAC returns to the water collector, it is pumped back to the compression heat pump unit through the first water pump for heating cycle control.

[0006] In one embodiment of the utility model, the input end of the low-temperature heat source circulation pump is also connected to a predetermined depth of deep sea water, so that the deep sea water of the predetermined depth is extracted through the input end of the low-temperature heat source circulation pump and pumped to the compression heat pump unit in the office area, and then returned to the sea through the corresponding outlet end of the compression heat pump unit. The compression heat pump unit sends the hot water after absorbing the warm water to the HVAC water supply network of the office area and the living area through the water distributor, and after the HVAC returns to the water collector, it is pumped back to the compression heat pump unit through the first water pump for cooling cycle control.

[0007] In one embodiment of the present invention, the input end of the low-temperature heat source circulation pump is connected to a predetermined depth ranging from -8 to -9 m from the horizontal surface of the deep sea water.

[0008] In one embodiment of the utility model, the first heating and cooling unit also includes: an internal circulation pump, a cooling tower and a second water pump. The input end of the cooling tower is connected to the output end of the compression heat pump unit. The output end of the cooling tower is connected to the compression heat pump unit, the water distributor, the HVAC water supply network and the water collector in sequence through the internal circulation pump. The input end of the compression heat pump unit is also connected to the domestic water pipeline. The second water pump is connected between the water collector and the compression heat pump unit to use the domestic water in the domestic water pipeline to transport it to the water distributor through the compression heat pump unit, and then to the HVAC water supply network of the office area and the living area through the water distributor. After the HVAC returns to the water collector, it is pumped back to the compression heat pump unit through the second water pump, and then returns to the cooling tower through the compression heat pump unit for cooling cycle control.

[0009] In one embodiment of the present invention, the cooling tower is a mechanical draft cooling tower.

[0010] In one embodiment of the present invention, the cooling tower is controlled to output cooling water cooled to a preset temperature to the compression heat pump unit.

[0011] In one embodiment of the utility model, the heating and cooling system also includes a switching valve, the input end of the switching valve is respectively connected to the output end of a low-temperature heat source circulation pump at a predetermined depth connected to deep sea water and the output end of an internal circulation pump installed on a cooling tower, and the output end of the switching valve is connected to the input end of a compression heat pump unit.

[0012] In one embodiment of the utility model, the compression heat pump unit includes: a first heat pump body, the first heat pump body includes a first evaporator, a compressor and a first condenser; a first heat exchange pipeline, the first heat exchange pipeline passes through one side of the first heat pump body to absorb the heat of the water source to be recovered in the first heat exchange pipeline through the heat transfer medium in the first heat pump body; and a second heat exchange pipeline, the second heat exchange pipeline passes through the other side of the first heat pump body to absorb the heat of the heat transfer medium in the first heat pump body through the water in the second heat exchange pipeline.

[0013] In one embodiment of the utility model, the absorption heat pump unit includes: a second heat pump body, the second heat pump body includes a second evaporator, a second condenser, an absorber and a generator; a third heat exchange pipeline, the third heat exchange pipeline passes through one side of the second heat pump body to absorb the heat of the water source to be recovered in the third heat exchange pipeline through the heat transfer medium in the second heat pump body; a fourth heat exchange pipeline, the fourth heat exchange pipeline passes through the other side of the second heat pump body to absorb the heat of the heat transfer medium in the second heat pump body through the water in the fourth heat exchange pipeline; and a steam pipeline, the steam pipeline passes through the second heat pump body to compress the steam through the circulation process of the lithium bromide solution in the evaporator and the absorber, generate high-temperature, high-pressure refrigerant steam, and exchange heat through the condenser and the evaporator.

[0014] Beneficial effects of the utility model: The utility model proposes a waste heat recycling and centralized heating and cooling system. This method realizes the trigeneration service of centralized heating, cooling and sanitary hot water for the nuclear power plant area, living area and adjacent green energy town by effectively utilizing the waste heat of nuclear power warm drainage. By designing to use seawater source heat pump units to absorb the waste heat of nuclear power warm drainage to make hot water in the nuclear power plant area, and using the seawater source heat pump units to absorb the cold energy of nuclear power cold seawater in the plant area to cool water, and using chillers in the living area to absorb tap water cold energy to cool water, by setting up energy stations in the nuclear power plant area for centralized heating and cooling and refrigeration substations in the living area for cooling, centralized heating in the plant area and hierarchical cooling in the plant area and living area are realized. And it is delivered to users in the plant area, living area and green energy town users through the hot water pipeline network to realize centralized heating, cooling and sanitary hot water. This system uses the waste heat of nuclear power warm drainage to make hot water, effectively reducing the discharge of heat from the unit's warm drainage, and achieving energy saving, environmental protection and practicality. Because the factory area is 6km away from the living area, it is impossible to use centralized cooling. Therefore, centralized heating and graded cooling technology is used in the factory and living areas to solve the problem of "triple supply" of centralized heating, cooling and domestic hot water in the factory and living areas. In addition, the heat recovery technology is used to produce sanitary hot water from the exhaust heat generated by refrigeration in summer, and hot water is produced from warm wastewater in other seasons. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the heating and cooling system of the present invention.

[0016] Figure 2 It is a structural diagram of a preferred embodiment of the first cooling and heating unit of the utility model.

[0017] Figure 3 This is a structural diagram of another preferred embodiment of the first cooling and heating unit of the utility model.

[0018] Figure 4 It is a schematic diagram of a preferred embodiment of the utility model when the compression heat pump unit exchanges heat with seawater.

[0019] Figure 5 It is a schematic diagram showing a preferred embodiment of the present invention when the compression heat pump unit exchanges heat with a cooling tower.

[0020] Figure 6 Shown is a schematic diagram of a preferred embodiment of the absorption heat pump unit of the present invention when exchanging heat.

[0021] Component number description

[0022] The first cooling and heating unit 1; the second cooling and heating unit 2; the switching valve 3; the hot water supply unit 4; the compression heat pump unit 11; the water distributor 12; the HVAC water supply network 13; the water collector 14; the low-temperature heat source circulation pump 15; the first water pump 16; the internal circulation pump 17; the cooling tower 18; the second water pump 19; the first heat pump body 111; the first heat exchange pipeline 112; the second heat exchange pipeline 113; the centralized energy station 21; the absorption heat pump unit 22; the water tank 23; the second heat pump body 221; the third heat exchange pipeline 222; the fourth heat exchange pipeline 223; the steam pipeline 224; the heat recovery heat pump unit 41; the domestic hot water tank 42. DETAILED DESCRIPTION

[0023] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0025] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0026] See also Figure 1The utility model provides a waste heat recycling and centralized heating and cooling system, comprising: a first heating and cooling unit 1, the first heating and cooling unit 1 comprising a compression heat pump unit 11, a water distributor 12, a HVAC water supply network 13 and a water collector 14 which are connected in sequence; a water source to be recovered with waste heat is pumped to the compression heat pump unit 11 for corresponding temperature adjustment, the compression heat pump unit 11 sends the water after absorbing the heat of the water source through the water distributor 12 to the HVAC water supply network 13, and returns the water to the water collector 14 and then returns to the compression heat pump unit 11 for controlled circulation; and a second heating and cooling unit 2 The second cooling and heating unit 2 includes a centralized energy station 21, an absorption heat pump unit 22 and a water tank 23 which are connected in sequence, so as to send the steam after cooling received by the nuclear power unit to the centralized energy station 21, and then connect it to the generator interface of the absorption heat pump unit 22, and return it to the water tank 23 through the absorption heat pump unit 22 after providing heat energy; and a hot water supply unit 4, the hot water supply unit 4 includes: a heat recovery heat pump unit 41, a domestic hot water tank 42, so as to obtain hot water after the warm drainage is heat-exchanged by the heat recovery heat pump unit 41, and pump it to the domestic hot water tank 42 for storage.

[0027] It is not difficult to find from the above content that in the process of using the nuclear power unit, the warm drainage and cold seawater discharged can be used in the first cooling and heating unit 1 and the second cooling and heating unit 2 to realize the cooling and heating of the nuclear power plant area, the living area, and the green energy town (that is, the town area mainly based on green environmental protection). In addition, domestic tap water and industrial water can also be used in the first cooling and heating unit 1 and the second cooling and heating unit 2 for cooling. Specifically, when the nuclear power unit discharges warm drainage, it can be discharged into the compression heat pump unit 11. After the water in the compression heat pump unit 11 obtains the heat of the warm drainage, it will be further pumped to the water distributor 12, and at the same time, the warm drainage is randomly discharged into the sea. The hot water in the water distributor 12 will further reach the HVAC water supply network 13 to heat the nuclear power plant area and the living area, and then return to the compression heat pump unit 11 through the water collector 14 for circulation heating. In the green energy town, similarly, the warm drainage of the nuclear power unit can also be used for heating. Moreover, when supplying heat to the green energy town, the steam received by the nuclear power unit can be discharged to the centralized energy station 21 after being decompressed, and after passing through the high temperature generator interface of the absorption heat pump unit, the steam can be sent from the condensate heat recovery device of the absorption heat pump unit to the condensate recovery device after providing heat energy, and finally returned to the water tank 23. Specifically, the water tank 23 can be a softening water tank or a hot water tank. Moreover, in the process of cooling the nuclear power plant area, living area, and green energy town, the water circulated to the water distributor 12 in the compression heat pump unit 11 can be refrigerated by connecting domestic tap water, industrial water, or cold seawater, and after the refrigeration is completed, it can be sent to the HVAC water supply network 13 through the water distributor 12 to cool the nuclear power plant area and living area. Through the above method, the warm drainage of nuclear power units can be well utilized in nuclear power plants, living areas, and green energy towns, and by using cold seawater through the compression heat pump unit 11 or domestic tap water and industrial water through the compression heat pump unit 11 for cooling, the "triple supply" of heating, cooling and sanitary hot water in different regions can be realized, wherein the seawater source heat pump unit, chiller and water supply pipeline for heating and cooling are integrated, which can effectively save engineering investment; centralized heating and graded refrigeration in the plant and living areas solve the problem of centralized heating and cooling in different regions, which has very good economy. Moreover, in the process of making domestic hot water, the warm drainage of the nuclear power unit is collected by using the low-temperature heat source circulation pump 15, and pumped to the heat recovery type heat pump unit 41, and after the heat recovery type heat pump unit 41 is heat-exchanged, the hot water obtained by heat exchange is pumped to the domestic hot water tank 42 for storage. Specifically, the heat recovery type heat pump unit 41 can be a seawater source compression type heat recovery type heat pump unit.

[0028] The utility model also provides a preferred embodiment, specifically, a seawater source heat pump unit, i.e., a compression type heat pump unit 11, is used to absorb the waste heat energy of warm drainage to heat the tap water to 55°C, and at the same time, the seawater source heat pump unit is used to absorb the cold energy of cold seawater in summer to turn the tap water into 6°C cold water, or a water chiller is used in the living area to produce 6°C cold water, and the 55°C hot water and 6°C cold water are sent to users in the factory area or living area through heating pipes. In addition, the heat recovery unit can also be used to absorb and reuse the waste heat in the refrigeration process in summer to produce sanitary hot water, and the warm drainage is used to produce hot water in other seasons, and the hot water temperature is 55°C.

[0029] like Figure 2 As shown, the first cooling and heating unit 1 also includes: a low-temperature heat source circulation pump 15 and a first water pump 16. The output end of the low-temperature heat source circulation pump 15 is connected to the input end of the compression heat pump unit 11. The input end of the low-temperature heat source circulation pump 15 is connected to the warm drainage interface of the nuclear power unit, so that the warm drainage of the nuclear power unit is pumped to the compression heat pump unit 11 in the office area through the low-temperature heat source circulation pump 15, and then returned to the sea through the corresponding outlet end of the compression heat pump unit 11. The compression heat pump unit 11 absorbs the hot water after the warm drainage and sends it to the HVAC water supply network 13 in the office area and the living area through the water distributor 12, and after the HVAC returns to the water collector 14, it is pumped back to the compression heat pump unit 11 through the first water pump 16 for heating cycle control. Specifically, the compression heat pump unit 11 can be a seawater source compression heat pump unit.

[0030] Furthermore, the input end of the low-temperature heat source circulation pump 15 is also connected to a predetermined depth of deep sea water, so that deep sea water of a predetermined depth is extracted through the input end of the low-temperature heat source circulation pump 15 and pumped to the compression heat pump unit 11 in the office area, and then returned to the sea through the corresponding outlet end of the compression heat pump unit 11. The compression heat pump unit 11 delivers the hot water after absorbing the warm water to the HVAC water supply network 13 in the office area and the living area through the water distributor 12, and after the HVAC returns to the water collector 14, it is pumped back to the compression heat pump unit 11 through the first water pump 16 for cooling cycle control. Specifically, the compression heat pump unit 11 can be a seawater source compression heat pump unit.

[0031] In one embodiment of the utility model, in summer, the chilled water of 6°C / 13°C in the refrigeration system during the refrigeration process can be directly used as a heat source to be sent to the compression heat pump unit 11. In winter, nuclear power warm wastewater is used as a heat source, and in the transition season, seawater is used as a heat source, which is sent to the compression heat pump unit 11 by the low-temperature heat source circulation pump 15. The compression heat pump unit 11 generates domestic hot water at about 50°C to 55°C, which is connected to the water tanks of the nuclear power plant area and the living area, and then sent to the user through a hot water pump.

[0032] Preferably, the input end of the low temperature heat source circulation pump 15 is connected to a predetermined depth ranging from -8 to -9 m from the deep sea water level.

[0033] like Figure 3 As shown, the first cooling and heating unit 1 also includes: an internal circulation pump 17, a cooling tower 18 and a second water pump 19. The input end of the cooling tower 18 is connected to the output end of the compression heat pump unit 11. The output end of the cooling tower 18 is connected to the compression heat pump unit 11, the water distributor 12, the HVAC water supply network 13 and the water collector 14 in sequence through the internal circulation pump 17. The input end of the compression heat pump unit 11 is also connected to the domestic water pipeline. The second water pump 19 is connected between the water collector 14 and the compression heat pump unit 11, so that the domestic water in the domestic water pipeline is transported to the water distributor 12 through the compression heat pump unit 11, and is sent to the HVAC water supply network 13 of the office area and the living area through the water distributor 12. After the HVAC returns to the water collector 14, it is pumped back to the compression heat pump unit 11 through the second water pump 19, and then returns to the cooling tower 18 through the compression heat pump unit 11 for cooling cycle control.

[0034] Specifically, the cooling tower 18 is a mechanical draft cooling tower.

[0035] Furthermore, the cooling tower 18 controls to output cooling water cooled to a preset temperature to the compression heat pump unit 11 .

[0036] In one embodiment of the utility model, during the refrigeration process of industrial water or tap water, the compression heat pump unit 11 can be a compression chiller (for refrigeration). The industrial water or tap water is transported to the compression heat pump unit 11 and then returned to the mechanical ventilation cooling tower for cooling. The outlet cold water of the compression heat pump unit 11 is sent to the water distributor 12, and then sent from the water distributor 12 to the HVAC water supply network 13 in the living area of ​​the nuclear power plant. After the HVAC return water returns to the water collector 14, it returns to the evaporator of the compression heat pump unit 11 through the cold (hot) water pump, i.e., the second water pump 19.

[0037] The utility model provides a preferred embodiment, that is, during winter heating, the warm drainage of the nuclear power unit is sent to the compression heat pump unit 11 in the office area through the low-temperature heat source circulation pump 15 for heat exchange (temperature drop of about 5°C) and then returned to the sea. The hot water (about 55°C) in the compression heat pump unit 11 is pumped to the water distributor 12, and sent from the water distributor 12 to the HVAC water supply network 13 in the office area and living area of ​​the nuclear power plant. After the HVAC return water reaches the water collector 14, it returns to the compression heat pump unit 11 (about 45°C) through the cold (hot) water pump. When heating the green energy town, the steam received from the nuclear power unit is cooled by the absorption heat pump unit 22 and then sent to the centralized energy station 21 of the green energy town, and then connected to the high-temperature generator interface of the absorption heat pump unit 22. After providing heat energy, it is sent from the condensate heat recovery device of the absorption heat pump unit 22 to the condensate recovery device, and finally returned to the softening water tank or hot water tank, that is, the water tank 23, to achieve heating of the green energy town.

[0038] The utility model also provides a preferred embodiment, that is, in the process of cooling in summer, ① cooling the office area: taking deep sea water (about -8 to -9m) and sending it to the compression heat pump unit 11 in the office area through the low-temperature heat source circulation pump 15 for heat exchange (temperature rise of about 6°C) and then returning to the sea. The cold water (about 6°C) at the outlet of the evaporator of the compression heat pump unit 11 is sent to the water distributor 12, and then sent from the water distributor 12 to the HVAC water supply network 13 in the office area of ​​the nuclear power plant. After the HVAC return water returns to the water collector 14, it returns to the evaporator of the heat pump unit (about 13°C) through the cold (hot) water pump, i.e., the first water pump 16. ②Cooling in living area: Industrial water or tap water (32℃) enters the chiller for heat exchange (38℃) and then returns to the mechanical draft cooling tower for cooling. The chiller outlet cold water (about 6℃) goes to the water distributor, and is sent from the water distributor to the HVAC water supply network in the living area of ​​the nuclear power plant. After the HVAC return water goes to the water collector, it returns to the evaporator of the heat pump unit through the cold (hot) water pump (about 13℃).

[0039] The utility model also provides a preferred embodiment, that is, in the process of producing domestic hot water, the compression heat pump unit 11 is used when producing domestic hot water for the nuclear power plant area and the living area. Specifically, in summer, the 6°C / 13°C chilled water in the refrigeration system can be directly used as a heat source to be sent to the compression heat pump unit 11, in winter, the warm wastewater of the nuclear power unit can be used as a heat source, and in the transition season, seawater can be used as a heat source, which is sent to the compression heat pump unit 11 by the low-temperature heat source circulation pump 15. The compression heat pump unit 11 produces domestic hot water at about 50°C to 55°C, which is connected to the domestic hot water tanks in the nuclear power plant area and the living area, and then delivered to the user through a hot water pump. When heating the green energy town, a shell and tube heat exchanger can be used, and the steam provided by the nuclear power unit is connected to the shell and tube heat exchanger to heat the tap water. The steam drain is returned to the nuclear power condensate pipeline or other recovery system by a drain pump. After the tap water is heated, it goes to the domestic hot water tank, that is, the water tank 23, and then delivered to the user through a hot water pump.

[0040] In a preferred embodiment of the waste heat recycling and centralized heating and cooling system of the utility model, three 3500kW seawater source compression heat pump units (for heating, 2 units for cooling in summer for nuclear power office area) + two 700kW seawater source compression heat recovery heat pump units (for domestic hot water) can be set in the nuclear power plant area, with three seawater low-temperature heat source pumps and three cold (hot) water circulation pumps, etc. Three 2000kW compression chillers (for cooling) are set in the nuclear power living area, with mechanical ventilation cooling towers, three cold water internal circulation pumps and three cold water circulation pumps, etc.

[0041] like Figure 2 and 3 As shown, the heating and cooling system also includes a switching valve 3, the input end of the switching valve 3 is respectively connected to the output end of the low-temperature heat source circulation pump 15 connected to the predetermined depth of the deep sea water and the output end of the internal circulation pump 17 installed on the cooling tower 18, and the output end of the switching valve 3 is connected to the input end of the compression heat pump unit 11.

[0042] In an embodiment of the present invention, the switching valve 3 can be a manual valve or other control valve to realize the control switching between industrial water and tap water for refrigeration cycle in cooling tower 18 and deep sea water for refrigeration cycle.

[0043] like Figure 4 and 5 As shown, the compression heat pump unit 11 includes: a first heat pump body 111, the first heat pump body 111 includes a first evaporator, a compressor and a first condenser; a first heat exchange pipeline 112, the first heat exchange pipeline 112 passes through one side of the first heat pump body 111, so as to absorb the heat of the water source to be recovered in the first heat exchange pipeline 112 through the heat transfer medium in the first heat pump body 111; and a second heat exchange pipeline 113, the second heat exchange pipeline 113 passes through the other side of the first heat pump body 111, so as to absorb the heat of the heat transfer medium in the first heat pump body 111 through the water in the second heat exchange pipeline 113.

[0044] In one embodiment of the utility model, the first heat pump body 111 is mainly composed of three parts: an evaporator, a compressor and a condenser. The summer cold source can be industrial water (or tap water) or seawater (deep seawater, which can come from the water intake of a nuclear power project, with a seawater temperature of 24.5°C to 29.6°C) and transported to the first heat pump body 111 through the first heat exchange pipeline 112. The heat transfer medium is allowed to continuously complete the thermal cycle process of evaporation (absorbing condensation heat in the circulating water) → compression → condensation (releasing heat and transferring it to the circulating water of the heat network) → throttling → re-evaporation, and the condensation heat in the circulating water is transferred to the circulating water of the heat network, i.e., the second heat exchange pipeline 113.

[0045] See also Figure 4After the seawater with a temperature of 24.5℃~29.6℃ is processed by the first heat pump body 111, the outlet water temperature rises to 30.5℃-35.6℃. The circulating water in the nuclear power plant area, living area and green energy town, which originally had a temperature of 13℃, drops to 6℃ after passing through the first heat pump body 111.

[0046] See also Figure 5 After the industrial water or tap water with a temperature of 32° C. is processed by the first heat pump body 111, the outlet water temperature rises to 37° C. After the first heat pump body 111 is heat-exchanged by the heat-conducting medium, the water temperature of the second heat exchange pipeline 113 is reduced from 13° C. to 6° C.

[0047] like Figure 6 As shown, the absorption heat pump unit 22 includes: a second heat pump body 221, the second heat pump body 221 includes a second evaporator, a second condenser, an absorber and a generator; a third heat exchange pipeline 222, the third heat exchange pipeline 222 passes through one side of the second heat pump body 221, so as to absorb the heat of the water source to be recovered in the third heat exchange pipeline 222 through the heat transfer medium in the second heat pump body 221; a fourth heat exchange pipeline 223, the fourth heat exchange pipeline 223 passes through the other side of the second heat pump body 221, so as to absorb the heat of the heat transfer medium in the second heat pump body 221 through the water in the fourth heat exchange pipeline 223; and a steam pipeline 224, the steam pipeline 224 passes through the second heat pump body 221, so as to compress the steam through the lithium bromide solution in the circulation process of the evaporator and the absorber, generate high-temperature and high-pressure refrigerant steam, and exchange heat through the condenser and the evaporator.

[0048] In one embodiment of the utility model, the second heat pump body 221 is mainly composed of four parts: an evaporator, a condenser, an absorber and a generator. The biggest difference between the absorption heat pump unit 22 and the compression heat pump unit 11 is that there is no compressor, but the absorption heat pump unit 22 acts as a compressor through the changes in the mass fraction, temperature and water vapor pressure of the lithium bromide solution in the circulation process of the generator and the absorber. Among them, the absorber plays a role equivalent to the suction stroke of the compressor, and continuously sucks out the condensed steam generated in the evaporator to maintain the low pressure in the evaporator. The generator plays the role of the compression stroke of the compressor, generating high-temperature and high-pressure refrigerant steam.

[0049] In the nuclear power office area unit plan, specifically, three 3500kW compression heat pump units 11 can be used to heat the nuclear power office plant area and living area, i.e., the green energy town, while taking into account the cooling conditions of the nuclear power office area. Two 700kW heat recovery heat pump units are used for domestic hot water in the nuclear power office plant area and living area, i.e., the green energy town.

[0050] In summary, the utility model absorbs the waste heat of warm drainage from the nuclear power plant to make hot water through the compression heat pump unit 11, and centrally provides heating and sanitary hot water for users in the nuclear power plant area, living area and adjacent green energy town; at the same time, the cooling seawater in the nuclear power plant area is refrigerated by the compression heat pump unit 11, and the living area is refrigerated by a chiller and tap water, that is, the plant area and the living area are refrigerated by graded refrigeration technology, which centrally provides cooling for users in the nuclear power plant area, living area and adjacent green energy town; the seawater source heat pump unit or chiller for heating and cooling and the water supply pipeline are integrated to realize the "triple supply" of heating, cooling and sanitary hot water in different regions, which can effectively save engineering investment. In addition, the heat pump unit discharges heat during the refrigeration process in summer. The heat recovery type heat pump unit absorbs the heat discharged in the refrigeration process and reuses it to make sanitary hot water. In other seasons, the waste heat of warm drainage is used to make sanitary hot water. In addition, it is realized that the steam provided by the nuclear power unit is used to drive the absorption heat pump unit 22 to heat and cool. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0051] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A waste heat recycling and central heating and cooling system, characterized in that: include: A first cooling and heating unit (1), the first cooling and heating unit (1) comprising a compression heat pump unit (11), a water distributor (12), a HVAC water supply network (13) and a water collector (14) which are connected in sequence; a water source to be recovered with waste heat is pumped to the compression heat pump unit (11) for corresponding temperature adjustment; the compression heat pump unit (11) sends water after absorbing the heat of the water source through the water distributor (12) to the HVAC water supply network (13), and returns the water to the water collector (14) and then returns to the compression heat pump unit (11) for control circulation; A second cooling and heating unit (2), the second cooling and heating unit (2) comprising a centralized energy station (21), an absorption heat pump unit (22) and a water tank (23) which are connected in sequence, so as to deliver the steam received from the nuclear power unit after being cooled to the centralized energy station (21), then connect to the generator interface of the absorption heat pump unit (22), and return to the water tank (23) through the absorption heat pump unit (22) after providing heat energy; as well as A hot water supply unit (4), the hot water supply unit (4) comprising: a heat recovery type heat pump unit (41) and a domestic hot water tank (42), so that warm wastewater is exchanged with heat by the heat recovery type heat pump unit (41) to obtain hot water, and the hot water is pumped to the domestic hot water tank (42) for storage.

2. The waste heat recycling and central heating and cooling system according to claim 1 is characterized in that: The first cooling and heating unit (1) further comprises: a low-temperature heat source circulation pump (15) and a first water pump (16); the output end of the low-temperature heat source circulation pump (15) is connected to the input end of the compression heat pump unit (11); the input end of the low-temperature heat source circulation pump (15) is connected to the warm drainage interface of the nuclear power unit, so that the warm drainage of the nuclear power unit is pumped to the compression heat pump unit (11) in the office area through the low-temperature heat source circulation pump (15), and then returned to the sea through the corresponding outlet end of the compression heat pump unit (11); the compression heat pump unit (11) absorbs the hot water from the warm drainage and sends it to the HVAC water supply network (13) in the office area and the living area through the water distributor (12); and after the HVAC water returns to the water collector (14), it is pumped back to the compression heat pump unit (11) through the first water pump (16) for heating circulation control.

3. The waste heat recycling and central heating and cooling system according to claim 2 is characterized in that: The input end of the low-temperature heat source circulation pump (15) is also connected to a predetermined depth of deep sea water, so that the deep sea water of a predetermined depth is extracted through the input end of the low-temperature heat source circulation pump (15) and pumped to the compression heat pump unit (11) in the office area, and after the HVAC return water is returned to the collector (14), it is pumped back to the compression heat pump unit (11) through the first water pump (16) for cooling cycle control.

4. The waste heat recycling and central heating and cooling system according to claim 3 is characterized in that: The input end of the low-temperature heat source circulation pump (15) is connected to a predetermined depth from the deep sea water level in the range of -8 to -9 m.

5. The waste heat recycling and central heating and cooling system according to claim 3 is characterized in that: The first cooling and heating unit (1) further comprises: an internal circulation pump (17), a cooling tower (18) and a second water pump (19); the input end of the cooling tower (18) is connected to the output end of the compression heat pump unit (11); the output end of the cooling tower (18) is connected to the compression heat pump unit (11), the water distributor (12), the HVAC water supply network (13) and the water collector (14) in sequence through the internal circulation pump (17); the input end of the compression heat pump unit (11) is also connected to the domestic water pipeline; the second water pump (19) ) is connected between the water collector (14) and the compression heat pump unit (11), so that the domestic water in the domestic water pipeline is transported to the water distributor (12) through the compression heat pump unit (11), and then transported to the HVAC water supply network (13) of the office area and the living area through the water distributor (12), and after the HVAC return water reaches the water collector (14), it is pumped back to the compression heat pump unit (11) through the second water pump (19), and then returned to the cooling tower (18) through the compression heat pump unit (11) for cooling cycle control.

6. The waste heat recycling and central heating and cooling system according to claim 5 is characterized in that: The cooling tower (18) is a mechanical draft cooling tower.

7. The waste heat recycling and central heating and cooling system according to claim 5, characterized in that: The cooling tower (18) controls the cooling water cooled to a preset temperature to be output to the compression heat pump unit (11).

8. The waste heat recycling and central heating and cooling system according to claim 5, characterized in that: The heating and cooling system further comprises a switching valve (3), the input end of the switching valve (3) being respectively connected to the output end of the low-temperature heat source circulation pump (15) connected to a predetermined depth of deep sea water and the output end of the internal circulation pump (17) installed on the cooling tower (18), and the output end of the switching valve (3) being connected to the input end of the compression heat pump unit (11).

9. The waste heat recycling and central heating and cooling system according to any one of claims 1 to 8, characterized in that: The compression heat pump unit (11) comprises: A first heat pump body (111), wherein the first heat pump body (111) comprises a first evaporator, a compressor and a first condenser; a first heat exchange pipeline (112), the first heat exchange pipeline (112) passing through one side of the first heat pump body (111) so as to absorb heat of a water source to be recovered from waste heat in the first heat exchange pipeline (112) through a heat transfer medium in the first heat pump body (111); and A second heat exchange pipeline (113), wherein the second heat exchange pipeline (113) passes through the other side of the first heat pump body (111) so as to absorb heat of the heat transfer medium in the first heat pump body (111) through water in the second heat exchange pipeline (113).

10. The waste heat recycling and central heating and cooling system according to claim 1, characterized in that: The absorption heat pump unit (22) comprises: A second heat pump body (221), wherein the second heat pump body (221) comprises a second evaporator, a second condenser, an absorber and a generator; A third heat exchange pipeline (222), the third heat exchange pipeline (222) passing through one side of the second heat pump body (221), so as to absorb heat of the water source to be recovered in the third heat exchange pipeline (222) through the heat transfer medium in the second heat pump body (221); a fourth heat exchange pipeline (223), the fourth heat exchange pipeline (223) passing through the other side of the second heat pump body (221), so as to absorb heat of the heat transfer medium in the second heat pump body (221) through water in the fourth heat exchange pipeline (223); and A steam pipeline (224) passes through the second heat pump body (221) to compress steam through the circulation process of the lithium bromide solution in the evaporator and the absorber to generate high-temperature and high-pressure refrigerant steam, and perform heat exchange through the condenser and the evaporator.

Images