Nuclear energy steam and heating supply system and method

Abstract

The application provides a nuclear energy steam supply and heating system and method. The nuclear energy steam supply and heating system comprises a first flow path, a second flow path, a third flow path and a fourth flow path. The first flow path is used for receiving a secondary circuit main steam. The second flow path is used for receiving desalted water. The third flow path is provided with a heat network heat exchanger. The fourth flow path is used for receiving a steam turbine high-pressure cylinder exhaust steam. The first flow path is configured so that the fluid in the first flow path can heat the fluid in the second flow path, and then heat the fluid in the third flow path through an absorption heat pump. The second flow path is configured so that the fluid in the second flow path can absorb heat to prepare industrial steam. The third flow path is configured so that the fluid in the third flow path can absorb heat through a first preheater, then absorb heat through an absorption heat pump, and then supply heat to a heating pipe network through a heat network heat exchanger. The fourth flow path is configured so that the fluid in the fourth flow path can drive the absorption heat pump, and then heat the fluid in the third flow path through the first preheater.

Description

Technical Field

[0001] This application relates to the field of nuclear energy technology, specifically to a nuclear energy gas supply and heating system and method. Background Technology

[0002] Nuclear steam supply and nuclear heating refer to clean energy solutions that utilize the heat generated by a nuclear reactor to produce industrial steam and provide heating, respectively. Facilities for nuclear steam supply and heating need to be located within the safety control area of ​​a nuclear power plant; however, the land available for these facilities in this area is extremely limited. There is an urgent need in this field to reduce the land area required for these facilities and to improve their energy utilization efficiency.

[0003] Therefore, this application provides a nuclear power steam supply and heating system and method to meet one or more of the above-mentioned technical needs. Summary of the Invention

[0004] The first aspect of this application aims to provide a nuclear power steam supply and heating system.

[0005] The second aspect of this application aims to provide a method for providing both nuclear steam and heating.

[0006] The purpose of the third aspect of this application is to provide a method for supplying steam using nuclear energy.

[0007] According to the first aspect of this application, a nuclear power steam supply and heating system includes: a first flow path, a second flow path, a third flow path, and a fourth flow path; wherein, the first flow path is used to receive secondary loop main steam; the second flow path is used to receive demineralized water; the third flow path is equipped with a heat exchanger; and the fourth flow path is used to receive exhaust steam from the high-pressure cylinder of the steam turbine; and the first flow path is configured such that the fluid in the first flow path can transfer heat to the fluid in the second flow path, and then transfer heat to the fluid in the third flow path through an absorption heat pump; the second flow path is configured such that the fluid in the second flow path can absorb heat to produce industrial steam; the third flow path is configured such that the fluid in the third flow path can absorb heat through a first preheater, then absorb heat through an absorption heat pump, and then supply heat to the heating network through the heat exchanger; and the fourth flow path is configured such that the fluid in the fourth flow path can drive an absorption heat pump, and then transfer heat to the fluid in the third flow path through the first preheater.

[0008] The nuclear power steam supply and heating system provided in this application fully utilizes the low-grade waste heat from the steam supply process for heating through an absorption heat pump, achieving a coupled design of the steam supply and heating systems. This helps save on the footprint of related facilities and improves thermal efficiency and economy. Furthermore, the second and third flow paths can be isolated from the secondary loop system, ensuring the safety of both steam supply and heating. The design of the fourth flow path first uses the exhaust steam from the high-pressure cylinder as the driving heat source for the absorption heat pump, and then uses the waste heat of the fluid in the fourth flow path to preheat the fluid in the third flow path. This achieves cascade utilization of the heat energy from the exhaust steam from the high-pressure cylinder, making it more energy-efficient than traditional nuclear heating technology that directly heats the circulating water system of the heating network using exhaust steam from the high-pressure cylinder.

[0009] In some embodiments of a nuclear power steam supply and heating system, a first pump, a second preheater, and a deaerator are sequentially provided in the second flow path.

[0010] In some embodiments of a nuclear power steam supply and heating system, a second pump, a third preheater, a steam generator, and a superheater are sequentially installed downstream of the deaerator in the second flow path to enable the preparation of industrial steam from demineralized water.

[0011] In some embodiments of a nuclear power steam supply and heating system, the first flow path passes sequentially through a superheater, a steam generator, a third preheater, and a second preheater to achieve heat transfer from the fluid in the first flow path to the fluid in the second flow path.

[0012] In some embodiments of a nuclear power steam supply and heating system, the fluid in the first flow path enters the condenser after passing through the absorption heat pump, and the fluid in the fourth flow path enters the condenser after passing through the first preheater.

[0013] In some embodiments of a nuclear power steam supply and heating system, the third flow path is configured such that the fluid in the third flow path can pass through a third pump, then through a first preheater, an absorption heat pump, a heat network heat exchanger, and then through the third pump again.

[0014] In some embodiments of a nuclear power steam supply and heating system, it is configured with a first operating state and a second operating state. The first operating state is configured as follows: the fluid in the first flow path transfers heat to the fluid in the second flow path, and then transfers heat to the fluid in the third flow path through an absorption heat pump, and then enters the condenser; the fluid in the second flow path absorbs heat to produce industrial steam; the fluid in the third flow path absorbs heat and then provides heating through a heat exchanger; the fluid in the fourth flow path drives the absorption heat pump, and then transfers heat to the fluid in the third flow path through a first preheater. The second operating state is configured as follows: the fluid in the first flow path transfers heat to the fluid in the second flow path, and then enters the condenser; the fluid in the second flow path absorbs heat to produce industrial steam.

[0015] In some embodiments of a nuclear power steam supply and heating system, one end of the second flow path is connected to a demineralized water tank, and the other end is connected to a steam supply network.

[0016] According to the nuclear power steam supply and heating method of the second aspect of this application, a nuclear power steam supply and heating system as described in the first aspect is used to supply steam and provide heating. The nuclear power steam supply and heating method includes: putting the nuclear power steam supply and heating system into a first operating state, the first operating state being configured such that: a fluid in a first flow path transfers heat to a fluid in a second flow path, and then transfers heat to a fluid in a third flow path through an absorption heat pump, and then enters a condenser; the fluid in the second flow path absorbs heat to produce industrial steam; the fluid in the third flow path absorbs heat and then provides heating through a heat exchanger; the fluid in the fourth flow path drives an absorption heat pump, and then transfers heat to the fluid in the third flow path through a first preheater.

[0017] According to the nuclear steam supply method of the third aspect of this application, a nuclear steam supply and heating system as described in the first aspect is used to supply steam. The nuclear steam supply method includes: putting the nuclear steam supply and heating system into a second operating state, wherein the second operating state is configured such that: the fluid in the first flow path transfers heat to the fluid in the second flow path and then enters the condenser; the fluid in the second flow path absorbs heat to produce industrial steam. Attached Figure Description

[0018] The above and other features, properties, and advantages of this application will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features. It should be noted that these drawings are merely illustrative and are not drawn to scale, and should not be construed as limiting the scope of protection actually claimed by this application, wherein: Figure 1 This is a schematic diagram of a nuclear power steam supply and heating system in its first working state according to an embodiment.

[0019] Figure 2 yes Figure 1 The diagram shown is a schematic of the nuclear power steam supply and heating system in its second operating state.

[0020] Explanation of reference numerals in the attached figures: 1. Nuclear gas supply and heating system; 10. First flow path; 11. Secondary loop main steam; 20. Second flow path; 21. Demineralized water; 22. Steam supply network; 23. First pump; 24. Deaerator; 25. Second pump; 30. Third flow path; 31. Heat exchanger for heating network; 32. Third pump; 40. Fourth flow path; 41. Exhaust steam from the high-pressure cylinder of the steam turbine; 51. Absorption heat pump; 52. First preheater; 53. Condenser; 54. Second preheater; 55. Third preheater; 56. Steam generator; 57. Superheater. Detailed Implementation

[0021] Reference will now be made in detail to various embodiments of this application, examples of which are shown in the accompanying drawings and described below. Although this application will be described in conjunction with exemplary embodiments, it should be understood that this application is not intended to be limited to those exemplary embodiments. Rather, this application is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents, and other embodiments that may be included within the spirit and scope of this application as defined by the appended claims.

[0022] This application uses specific terms to describe embodiments of the application. For example, "an embodiment" and / or "one embodiment" refers to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment" or "one embodiment" mentioned twice or more in different locations in this application does not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0023] In this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying positional relationships or order of importance.

[0024] In the following description, the orientation or positional relationship indicated by terms such as "upper," "lower," "inner," "outer," "front," "back," or other directional terms is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed and / or be implemented in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] In the following description, unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," "contact," etc., should be interpreted broadly; for example, they can refer to fixed connections or movable connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this application according to the specific circumstances.

[0026] See Figure 1 , Figure 2The nuclear power steam supply and heating system 1 shown includes: a first flow path 10, a second flow path 20, a third flow path 30, and a fourth flow path 40. The first flow path 10 receives the main steam 11 from the secondary loop. The main steam 11 in the secondary loop refers to a portion of the steam generated by the steam generator in the secondary loop system of a nuclear power plant and extracted before entering the high-pressure cylinder of the turbine. The second flow path 20 receives demineralized water 21. The third flow path 30 is equipped with a heat exchanger 31. Generally, water flows through the third flow path 30. The fourth flow path 40 receives the exhaust steam 41 from the high-pressure cylinder of the turbine in the secondary loop system. Furthermore, the first flow path 10 is configured such that the fluid in the first flow path 10 can transfer heat to the fluid in the second flow path 20, and then transfer heat to the fluid in the third flow path 30 through an absorption heat pump 51. The absorption heat pump 51 is a device that uses thermal energy as a driving energy source and achieves heat transfer from a low temperature to a high temperature through an absorption-desorption cycle of absorbent and refrigerant. The second flow path 20 is configured such that the fluid in the second flow path 20 can absorb heat to produce industrial steam. The third flow path 30 is configured such that the fluid in the third flow path 30 can absorb heat through the first preheater 52, then absorb heat through the absorption heat pump 51, and then transfer the heat to the heating network through the heat exchanger 31 to achieve heating. The fourth flow path 40 is configured such that the fluid in the fourth flow path 40 can drive the absorption heat pump 51, and then transfer heat to the fluid in the third flow path 30 through the first preheater 52.

[0027] The nuclear power steam supply and heating system 1 provided in this application fully utilizes the low-grade waste heat from the steam supply process for heating through an absorption heat pump 51, achieving a coupled design of the steam supply and heating systems. This saves space and improves thermal efficiency and economy. Furthermore, the second flow path 20 and the third flow path 30 can achieve physical isolation of their internal fluids from the secondary loop system, ensuring the safety of steam supply and heating. The design of the fourth flow path 40 first uses the exhaust steam from the high-pressure cylinder as the driving heat source for the absorption heat pump 51, and then uses the waste heat from the fourth flow path 40 to preheat the fluid in the third flow path 30, achieving cascade utilization of the heat energy from the exhaust steam from the high-pressure cylinder. This is more energy-efficient than traditional nuclear heating technology that directly heats the circulating water system of the heating network using exhaust steam from the high-pressure cylinder.

[0028] like Figure 1 As shown, in some embodiments, one end of the second flow path 20 is connected to a demineralized water tank 21 to receive demineralized water 21. The other end is connected to a steam supply network 22 to transport industrial steam prepared using the demineralized water 21 through the steam supply network 22.

[0029] like Figure 1As shown, in some embodiments, a first pump 23, a second preheater 54, and a deaerator 24 are sequentially provided in the second flow path 20, so as to use the first pump 23 to transport demineralized water 21 in the second flow path 20, preheat the demineralized water 21 through the second preheater 54, and remove oxygen from the demineralized water 21 through the deaerator 24. This design is beneficial to improving thermal efficiency and economy.

[0030] In some embodiments, downstream of the deaerator 24 in the second flow path 20, a second pump 25, a third preheater 55, a steam generator 56, and a superheater 57 are sequentially provided. The second pump 25 is used to pressurize the demineralized water 21 to ensure the delivery of the demineralized water 21. The third preheater 55 is used to preheat the demineralized water 21. The steam generator 56 is used to make the demineralized water 21 absorb heat to generate steam. The superheater 57 is used to make the steam reach the superheat temperature, thereby realizing the preparation of industrial steam. This design is beneficial to improving thermal efficiency and economy.

[0031] In some embodiments, the first flow path 10 passes sequentially through a superheater 57, a steam generator 56, a third preheater 55, and a second preheater 54, so that the fluid in the first flow path 10 can sequentially pass through the superheater 57, the steam generator 56, the third preheater 55, and the second preheater 54 to transfer heat to the fluid in the second flow path 20 in a step-by-step manner, so as to match the needs of different grades of heat energy at different stages in the process of preparing industrial steam, thereby improving thermal efficiency and economy.

[0032] In some embodiments, the first flow path 10 is configured such that, after the secondary loop main steam 11 undergoes successive heat release, it becomes condensate at a temperature of less than 100°C and greater than or equal to 60°C at the outlet of the second preheater 54, and the condensate enters the absorption heat pump 51 as a low-grade heat source.

[0033] like Figure 1 As shown, in some embodiments, the fluid in the first flow path 10, after passing through the absorption heat pump 51, and the fluid in the fourth flow path 40, after passing through the first preheater 52, both enter the condenser and condense into water to ensure the steam-water balance of the unit.

[0034] like Figure 1 As shown, in some embodiments, the third flow path 30 is configured such that the fluid in the third flow path 30 can pass through the third pump 32, then through the first preheater 52, the absorption heat pump 51, the heat network heat exchanger 31, and then through the third pump 32 again. That is, the third flow path 30 is configured as a circulation loop, which helps to ensure the stable and efficient operation of the first preheater 52, the absorption heat pump 51, the heat network heat exchanger 31, etc.

[0035] Specifically, in some embodiments, the high-pressure cylinder exhaust steam of the fourth flow path 40 becomes condensate at about 85°C after being processed by the absorption heat pump 51, and then enters the first preheater 52 to preheat the water in the third flow path 30. The water in the third flow path 30 can be at about 30°C at the inlet of the first preheater 52, without limitation.

[0036] In some embodiments, the nuclear power steam supply and heating system 1 is configured with a first operating state and a second operating state to flexibly switch between operating states during the heating season and non-heating season, so as to meet different needs and improve economic efficiency.

[0037] like Figure 1 As shown, the first operating state is configured as follows: the fluid in the first flow path 10 transfers heat to the fluid in the second flow path 20, and then transfers heat to the fluid in the third flow path 30 through the absorption heat pump 51, before entering the condenser; the fluid in the second flow path 20 absorbs heat to produce industrial steam; the fluid in the third flow path 30 absorbs heat and then provides heating through the heat exchanger 31; the fluid in the fourth flow path 40 drives the absorption heat pump 51, and then transfers heat to the fluid in the third flow path 30 through the first preheater 52. When the nuclear power steam supply and heating system 1 is operating in the first operating state, it can simultaneously meet the needs of steam supply and heating.

[0038] like Figure 2 As shown, the second operating state is configured as follows: the fluid in the first flow path 10 transfers heat to the fluid in the second flow path 20 and then directly enters the condenser; the fluid in the second flow path 20 absorbs heat to produce industrial steam, which is more suitable for use in the non-heating season.

[0039] This application also provides a nuclear power steam supply and heating method, which uses a nuclear power steam supply and heating system 1 to achieve steam supply and heating, including: putting the nuclear power steam supply and heating system 1 into a first working state, the first working state being configured as follows: the fluid in the first flow path 10 transfers heat to the fluid in the second flow path 20, and then transfers heat to the fluid in the third flow path 30 through an absorption heat pump 51, and then enters the condenser; the fluid in the second flow path 20 absorbs heat to produce industrial steam; the fluid in the third flow path 30 absorbs heat, and then provides heating through a heat exchanger 31; the fluid in the fourth flow path 40 drives the absorption heat pump 51, and then transfers heat to the fluid in the third flow path 30 through a first preheater 52.

[0040] According to a nuclear power steam supply method based on a third aspect of this application, a nuclear power steam supply and heating system 1 is used to supply steam. The method includes: placing the nuclear power steam supply and heating system 1 in a second operating state, wherein the second operating state is configured such that: fluid in the first flow path 10 transfers heat to fluid in the second flow path 20, and then enters a condenser; the fluid in the second flow path 20 absorbs heat to produce industrial steam. This nuclear power steam supply method uses only the nuclear power steam supply and heating system 1 for steam supply, making it suitable for use during the non-heating season and ensuring economic benefits.

[0041] In summary, the beneficial technical effects of this application include, but are not limited to, at least one of the following: The nuclear power steam supply and heating system provided in this application fully utilizes the low-grade waste heat from the steam supply process for heating through an absorption heat pump, achieving a coupled design of the steam supply and heating systems. This design helps save space and improves thermal efficiency and economy. Furthermore, the second and third flow paths can be isolated from the secondary loop system, ensuring the safety of both steam supply and heating. The design of the fourth flow path first uses the exhaust steam from the high-pressure cylinder as the driving heat source for the absorption heat pump, and then uses the waste heat of the fluid in the fourth flow path to preheat the fluid in the third flow path. This achieves cascade utilization of the heat energy from the exhaust steam from the high-pressure cylinder, making it more energy-efficient than traditional nuclear heating technology that directly heats the circulating water system of the heating network using exhaust steam from the high-pressure cylinder.

[0042] While this application discloses preferred embodiments as described above, it is not intended to limit the scope of this application. Any changes and modifications can be made by those skilled in the art without departing from the spirit and scope of this application. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application, without departing from the content of the technical solution of this application, fall within the protection scope defined by the claims of this application.

Claims

1. A nuclear power steam supply and heating system, characterized in that, include: The system comprises a first flow path, a second flow path, a third flow path, and a fourth flow path; wherein the first flow path is used to receive the main steam from the secondary loop; the second flow path is used to receive demineralized water; the third flow path is equipped with a heat exchanger; and the fourth flow path is used to receive exhaust steam from the high-pressure cylinder of the steam turbine; and... The first flow path is configured such that the fluid in the first flow path can transfer heat to the fluid in the second flow path, and then transfer heat to the fluid in the third flow path through an absorption heat pump; The second flow path is configured such that the fluid in the second flow path can absorb heat to produce industrial steam; The third flow path is configured such that the fluid in the third flow path can absorb heat through the first preheater, then absorb heat through the absorption heat pump, and then supply heat to the heating network through the heat exchanger. The fourth flow path is configured such that the fluid in the fourth flow path can drive the absorption heat pump, and then transfer heat to the fluid in the third flow path through the first preheater.

2. The nuclear power steam supply and heating system according to claim 1, characterized in that, The second flow path is provided with a first pump, a second preheater, and a deaerator in sequence.

3. The nuclear power steam supply and heating system according to claim 2, characterized in that, In the second flow path, downstream of the deaerator, there are also a second pump, a third preheater, a steam generator, and a superheater, in sequence, to realize the preparation of industrial steam from demineralized water.

4. The nuclear power steam supply and heating system according to claim 3, characterized in that, The first flow path passes sequentially through the superheater, the steam generator, the third preheater, and the second preheater to achieve heat transfer from the fluid in the first flow path to the fluid in the second flow path.

5. The nuclear power steam supply and heating system according to claim 1, characterized in that, The fluid in the first flow path enters the condenser after passing through the absorption heat pump, and the fluid in the fourth flow path enters the condenser after passing through the first preheater.

6. The nuclear power steam supply and heating system according to claim 1, characterized in that, The third flow path is configured such that the fluid in the third flow path can pass through the third pump, then through the first preheater, the absorption heat pump, the heat network heat exchanger, and then through the third pump.

7. The nuclear power steam supply and heating system according to claim 1, characterized in that, It is configured with a first working state and a second working state; The first operating state is configured as follows: the fluid in the first flow path transfers heat to the fluid in the second flow path, and then transfers heat to the fluid in the third flow path through the absorption heat pump, and then enters the condenser; the fluid in the second flow path absorbs heat to produce industrial steam; the fluid in the third flow path absorbs heat and then provides heating through the heat network heat exchanger; the fluid in the fourth flow path drives the absorption heat pump, and then transfers heat to the fluid in the third flow path through the first preheater; The second operating state is configured as follows: the fluid in the first flow path transfers heat to the fluid in the second flow path and then enters the condenser; the fluid in the second flow path absorbs heat to produce industrial steam.

8. The nuclear power steam supply and heating system according to claim 1, characterized in that, One end of the second flow path is connected to the demineralized water tank, and the other end is connected to the steam supply network.

9. A method for providing both steam and heating using nuclear energy, characterized in that, The method of supplying steam and heating using a nuclear power steam supply and heating system as described in any one of claims 1 to 8 includes: The nuclear power steam supply and heating system is configured to operate in a first working state, wherein the fluid in the first flow path transfers heat to the fluid in the second flow path, and then transfers heat to the fluid in the third flow path through the absorption heat pump, and then enters the condenser; the fluid in the second flow path absorbs heat to produce industrial steam; the fluid in the third flow path absorbs heat and then provides heating through the heat exchanger; the fluid in the fourth flow path drives the absorption heat pump and then transfers heat to the fluid in the third flow path through the first preheater.

10. A method for supplying steam using nuclear energy, characterized in that, The nuclear power steam supply and heating system as described in any one of claims 1 to 8 is used to supply steam, and the nuclear power steam supply method includes: The nuclear power steam supply and heating system is put into a second operating state, which is configured as follows: The fluid in the first flow path transfers heat to the fluid in the second flow path and then enters the condenser; the fluid in the second flow path absorbs heat to produce industrial steam.

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