Offshore wind power platform heat recovery and water heat supply system

Abstract

The application discloses a kind of offshore wind power platform heat recovery and water heat supply system, including wind power platform cooling unit, absorption heat pump unit, seawater supply unit and water heat supply unit, wind power platform cooling unit includes heating equipment cooling assembly, cooling water circulation pipeline and first circulation branch, first circulation branch is connected on cooling water circulation pipeline, absorption heat pump unit includes first circulation pipeline, generator, absorber, evaporator and condenser, first circulation branch passes through generator, cooling water circulation pipeline passes through evaporator, seawater supply unit includes the first water supply pipeline passing through condenser, water heat supply unit includes the second circulation pipeline passing through absorber and heat using equipment.The offshore wind power platform heat recovery and water heat supply system of the application can recover waste heat between wind power platform equipment, further realize water heat supply in combination with heating system, and enrich the diversity of waste heat utilization scene.

Description

Technical Field

[0001] This invention relates to the field of energy technology, and more specifically, to a heat recovery and combined hydropower system for offshore wind power platforms. Background Technology

[0002] With the rapid development of offshore wind power technology, the power generation capacity of a single offshore wind turbine is gradually increasing. Due to the high integration of offshore wind turbines and the large heat dissipation of the supporting mechanical and power electronic equipment, good heat dissipation is an important guarantee for maintaining the stable operation of offshore wind turbines.

[0003] Currently, offshore wind power platform generator equipment is generally cooled by direct air cooling, direct water cooling, or by water-cooled units based on compression refrigeration cycles. However, the aforementioned methods use air or water sources for cooling, making it difficult to recover waste heat and achieve subsequent comprehensive utilization, resulting in a large waste of energy.

[0004] Therefore, designing a recovery system to realize the recovery and utilization of heat from offshore wind power platforms has great research value. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] The offshore wind power platform heat recovery and combined heat and water supply system of this invention includes: a wind power platform cooling unit, which includes a heat-generating equipment cooling component, a cooling water circulation pipeline, and a first circulation branch. The heat-generating equipment cooling component is disposed on the cooling water circulation pipeline, and the first circulation branch is connected in parallel to the cooling water circulation pipeline; an absorption heat pump unit, which includes a first circulation pipeline and a generator, absorber, evaporator, and condenser disposed thereon. The first circulation branch passes through the generator, and the cooling water circulation pipeline passes through the evaporator; a seawater supply unit, which includes a first water supply pipeline that passes through the condenser; and a combined heat and water supply unit, which includes a second circulation pipeline and heat-using equipment disposed thereon. The second circulation pipeline passes through the absorber.

[0007] The offshore wind power platform heat recovery and combined heat and water system of this invention involves a cooling water circulation pipe of the wind power platform cooling unit passing through the evaporator of the absorber heat pump unit. A first circulation branch is connected to the cooling water circulation pipe of the wind power platform cooling unit and passes through the generator of the absorption heat pump unit, thereby transferring the waste heat from the cooling chamber of the wind power platform equipment to the absorption heat pump unit. Then, through a second circulation pipe passing through the absorber, the heat energy is transferred to the combined heat and water system, completing the recovery and utilization of the waste heat from the wind power platform equipment. At the same time, seawater can be used to cool the heat pump circulation working fluid through the first water supply pipe passing through the condenser. Thus, this application can utilize the heat recovery system of the absorption heat pump to recover the waste heat between the wind power platform equipment without using high-grade heat energy to drive the medium-temperature heat energy to high-temperature heat energy with higher utilization value. It also uses seawater with a relatively stable temperature as a cooling medium to absorb low-temperature heat energy. Combined with the heating system, it further realizes combined heat and water supply, enriching the diversity of waste heat utilization scenarios and the value of waste heat utilization.

[0008] In some embodiments, a first heat exchanger is provided between the outlet pipe of the generator and the outlet pipe of the absorber.

[0009] In some embodiments, a throttling valve is provided on the inlet pipe of the generator, and the throttling valve is located between the first heat exchanger and the generator.

[0010] In some embodiments, the heat-using device includes a radiator and a second heat exchanger, the radiator being connected to a heat dissipation circulation pipeline, and the second heat exchanger being provided between the heat dissipation circulation pipeline and the second circulation pipeline.

[0011] In some embodiments, the second circulation pipeline is further provided with a multi-effect evaporator, which includes a seawater inlet and a freshwater outlet. The seawater supply unit further includes a second water supply pipeline, which is connected to the seawater inlet, and the freshwater outlet is connected to an external water storage tank.

[0012] In some embodiments, the multi-effect evaporator also has a concentrated brine outlet.

[0013] In some embodiments, the second circulation pipeline includes a main circulation path, a first branch path, and a second branch path. The main circulation path passes through the absorber, the first branch path and the second branch path are connected in parallel on the main circulation path, and the first branch path passes through the second heat exchanger and the second branch path passes through the multi-effect evaporator.

[0014] In some embodiments, the seawater supply unit further includes a main seawater input line, which is equipped with a seawater pump and is connected to both the first water supply pipeline and the second water supply pipeline.

[0015] In some embodiments, a filter is also provided on the main seawater inlet.

[0016] In some embodiments, a first switching valve is provided on the first branch and a second switching valve is provided on the second branch. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a heat recovery and combined hydrothermal system for an offshore wind power platform according to an embodiment of the present invention.

[0018] Figure label:

[0019] Wind power platform cooling unit 1; absorption heat pump unit 2; combined water and heat supply unit 3; heating equipment cooling assembly 11; evaporator 201; cooling water circulation pipeline 202; first circulation branch 203; absorber 204; generator 205; condenser 206; refrigerant water pump 207; first heat exchanger 208; solution pump 209; first circulation pipeline 210; second circulation pipeline 211; throttle valve 212; seawater input main pipeline 215; filter 216; seawater pump 217; first water supply pipeline 218; multi-effect evaporator 31; second water supply pipeline 32; concentrated brine outlet 33; freshwater pump 34; water storage tank 35; second heat exchanger 36; radiator 37. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] like Figure 1 As shown, the offshore wind power platform heat recovery and combined heat and water system of this embodiment includes a wind power platform cooling unit 1, an absorption heat pump unit 2, a seawater supply unit, and a combined heat and water system 3.

[0022] Specifically, the wind power platform cooling unit 1 includes a heat-generating equipment cooling component 11, a cooling water circulation pipe 202, a first circulation branch 203, and an evaporator 201. The heat-generating equipment cooling component 11 is mounted on the cooling water circulation pipe 202, and the first circulation branch 203 is connected to the cooling water circulation pipe 202. The absorption heat pump unit 2 includes a first circulation pipe 210 and a generator 205, an absorber 204, an evaporator 201, and a condenser 206 mounted thereon. The first circulation branch 203 passes through the generator 205, and the cooling water circulation pipe 202 passes through the evaporator 201. The seawater supply unit includes a first water supply pipe 218, which passes through the condenser 206. The combined water and heat supply unit 3 includes a second circulation pipe 211 and heat-using equipment mounted thereon. The second circulation pipe 211 passes through the absorber 204.

[0023] Therefore, after absorbing heat from the equipment room of the wind power platform, part of the cooling water in the cooling water circulation pipe 202 flows into the first circulation branch 203. When the cooling water in the first circulation branch 203 flows through the generator 205, it can exchange heat with the working fluid in the absorption heat pump unit 2. The cooled cooling water continues to flow along the cooling water circulation pipe 202 to continue cooling the wind power platform equipment.

[0024] Furthermore, after the lithium bromide-water solution inside the generator 205 absorbs heat, the low-boiling-point water vaporizes and forms water vapor. Then, the low-pressure water vapor enters the condenser 206 through the steam outlet pipe and exchanges heat with the seawater in the first water supply pipe 218 to form liquid water. Then, the liquid water is pressurized by the refrigerant water pump 207 and enters the evaporator 201 to exchange heat with the cooling water in the cooling water circulation pipe 202. The liquid water absorbs the mid-temperature residual heat of the cooling water to form high-pressure water vapor. Then, the high-pressure water vapor enters the absorber 204 and is absorbed by the lithium bromide-water concentrated solution to form a dilute solution. This process releases heat to the outside to produce high-temperature water vapor, realizing the upgrading of medium-temperature heat energy to high-temperature heat energy.

[0025] Furthermore, after the lithium bromide-water dilute solution that has completed water vapor absorption is depressurized, it enters generator 205 to complete evaporation. Subsequently, the concentrated solution is pressurized and enters absorber 204 in high-pressure zone to complete one cycle of lithium bromide-water solution.

[0026] Furthermore, the working fluid in the second circulation pipeline 211 can supply heat to the heat-using equipment after absorbing heat in the absorber 204, thus realizing the utilization of waste heat from the wind power platform equipment.

[0027] In the offshore wind power platform heat recovery and combined heat and water system of this embodiment, the cooling water circulation pipe 202 of the wind power platform cooling unit 1 passes through the evaporator 201 of the absorber heat pump unit 2. The first circulation branch 203 is connected to the cooling water circulation pipe 202 and passes through the generator 205 of the absorber heat pump unit 2, thereby transferring the waste heat from the cooling chamber of the wind power platform equipment to the absorber heat pump unit 2. Then, the heat energy is transferred to the combined heat and water system 3 via the second circulation pipe 211 passing through the absorber 204, thus completing the waste heat recovery of the wind power platform equipment. The system can recycle and reuse waste heat, and at the same time, seawater can be used to cool the heat pump circulating working fluid through the first water supply pipe 218 passing through the condenser 206. Thus, this application can use the heat recovery system of the absorption heat pump to recover waste heat in the wind power platform equipment room, and can raise the medium temperature heat energy to the high temperature heat energy with higher utilization value without using high-grade heat energy to drive it. It can also use seawater with a relatively stable temperature as a cooling medium to absorb low temperature heat energy, and further realize water and heat supply in combination with the heating system, enriching the diversity of waste heat utilization scenarios and the value of waste heat utilization.

[0028] Furthermore, such as Figure 1As shown, a first heat exchanger 208 is installed between the outlet pipe of generator 205 and the outlet pipe of absorber 204. A throttling valve 212 is installed on the inlet pipe of generator 205, and a solution pump 209 is installed on the outlet pipe. The throttling valve 212 is located between the first heat exchanger 208 and generator 205. Thus, the dilute lithium bromide-water solution that has completed water vapor absorption is depressurized by the first heat exchanger 208 and the throttling valve 212 and enters generator 205 to complete evaporation. Subsequently, the concentrated solution is pressurized by the first heat exchanger 208 and the solution pump 209 and enters absorber 204 in the high-pressure zone to complete one cycle of lithium bromide-water solution.

[0029] Optionally, such as Figure 1 As shown, the heat-using equipment includes a radiator 37 and a second heat exchanger 36. The radiator 37 is connected to the heat dissipation circulation pipe, and the second heat exchanger 36 is provided between the heat dissipation circulation pipe and the second circulation pipe 211. Thus, the heat dissipation circulation pipe can absorb heat from the working fluid in the second circulation pipe 211 through the second heat exchanger 36, and the heat can be transferred to the radiator 37 to achieve functions such as heating in residential areas. In other words, utilizing recovered waste heat as a heat source for heating residential areas is one of the functions of the combined water and heat supply system of this application.

[0030] Furthermore, such as Figure 1 The utilization of waste heat in this application is not limited to the basic requirement of using it as a heating source. Considering the lack of freshwater resources at sea, this application can convert seawater into freshwater locally. Specifically, a multi-effect evaporator 31 is also provided on the second circulation pipeline 211. The multi-effect evaporator 31 includes a seawater inlet, a freshwater outlet, and a concentrated brine outlet 33. The seawater supply unit also includes a second water supply pipeline 32, which is connected to the seawater inlet and the freshwater outlet to an external water storage tank 35.

[0031] Understandably, the heat source of the multi-effect evaporator 31 is provided by the high-quality heat energy generated by the absorption heat pump unit 2. After multi-effect evaporation, seawater is converted into fresh water and some concentrated brine. The fresh water enters the water storage tank 35 through the fresh water pump 34 and can be used to supplement the equipment cooling circulating water or other process water consumption. It can also provide domestic water with different temperature requirements for offshore wind power platform operation and maintenance personnel. The concentrated brine is discharged through the concentrated brine outlet 33.

[0032] Preferably, the second circulation pipeline 211 includes a main circulation path, a first branch path, and a second branch path. The main circulation path passes through the absorber 204, and the first and second branch paths are connected in parallel on the main circulation path. The first branch path passes through the second heat exchanger 36, and the second branch path passes through the multi-effect evaporator 31. Thus, by setting two parallel branches for seawater desalination and heating respectively, the problem of heat energy imbalance caused by gradient heat exchange can be avoided.

[0033] Furthermore, such as Figure 1As shown, the seawater supply unit also includes a main seawater inlet 215, on which a seawater pump 217 is installed. The main seawater inlet 215 is connected to both the first water supply pipeline 218 and the second water supply pipeline 32. In other words, the first water supply pipeline 218 and the second water supply pipeline 32 are connected to the same main pipeline, which optimizes the pipeline layout and reduces the number of pipelines and the number of seawater pumps 217.

[0034] Preferably, a filter 216 is also provided on the main seawater inlet 215 to filter impurities and avoid affecting the operation of the system.

[0035] Preferably, a first switching valve is provided on the first branch and a second switching valve is provided on the second branch. Thus, the first switching valve can control the flow of the working fluid in the first branch, and the second switching valve can control the flow of the working fluid in the second branch, thereby enabling the rational distribution of heat energy according to usage requirements. For example, when seawater desalination is not required, the second switching valve can be closed.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] It should be understood that the application of this invention is not limited to the detailed structure and arrangement of the components presented in this specification. The invention can have other embodiments and can be implemented and performed in various ways. The foregoing variations and modifications fall within the scope of this invention. It should be understood that the invention as described and defined in this specification extends to all alternative combinations of two or more individual features mentioned or apparent in the text and / or drawings. All these different combinations constitute multiple alternative aspects of the invention. The embodiments described in this specification illustrate the best known mode for carrying out the invention and will enable those skilled in the art to utilize the invention.

Claims

1. A heat recovery and combined hydrothermal system for offshore wind power platforms, characterized in that, include: A wind power platform cooling unit, comprising a heat-generating equipment cooling component, a cooling water circulation pipeline, and a first circulation branch, wherein the heat-generating equipment cooling component is disposed on the cooling water circulation pipeline, and the first circulation branch is connected in parallel to the cooling water circulation pipeline; An absorption heat pump unit, comprising a first circulation pipeline and a generator, absorber, evaporator and condenser disposed thereon, wherein the first circulation branch passes through the generator and the cooling water circulation pipeline passes through the evaporator; A seawater supply unit, the seawater supply unit including a first water supply pipeline passing through the condenser; A combined water and heat supply unit, the combined water and heat supply unit includes a second circulation pipeline and heat-using equipment installed thereon, the second circulation pipeline passing through the absorber; the heat-using equipment includes a radiator and a second heat exchanger, the radiator being connected to the heat dissipation circulation pipeline, and the second heat exchanger being provided between the heat dissipation circulation pipeline and the second circulation pipeline; The second circulation pipeline is also equipped with a multi-effect evaporator, which includes a seawater inlet and a freshwater outlet. The seawater supply unit also includes a second water supply pipeline, which is connected to the seawater inlet and the freshwater outlet is connected to an external water storage tank. The second circulation pipeline includes a main circulation path, a first branch path, and a second branch path. The main circulation path passes through the absorber, and the first branch path and the second branch path are connected in parallel on the main circulation path. The first branch path passes through the second heat exchanger, and the second branch path passes through the multi-effect evaporator.

2. The offshore wind power platform heat recovery and combined hydrothermal system according to claim 1, characterized in that, A first heat exchanger is provided between the outlet pipe of the generator and the outlet pipe of the absorber.

3. The offshore wind power platform heat recovery and combined heat and water system according to claim 2, characterized in that, A throttling valve is provided on the inlet pipe of the generator, and the throttling valve is located between the first heat exchanger and the generator.

4. The offshore wind power platform heat recovery and combined hydrothermal system according to claim 1, characterized in that, The multi-effect evaporator also has a concentrated brine outlet.

5. The offshore wind power platform heat recovery and combined hydropower system according to claim 4, characterized in that, The seawater supply unit also includes a main seawater input line, which is equipped with a seawater pump and is connected to both the first water supply pipeline and the second water supply pipeline.

6. The offshore wind power platform heat recovery and combined hydrothermal system according to claim 5, characterized in that, A filter is also installed on the main seawater input line.

7. The offshore wind power platform heat recovery and combined hydrothermal system according to claim 1, characterized in that, A first switching valve is provided on the first branch, and a second switching valve is provided on the second branch.

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