A highly integrated fully-enclosed integrated power conversion device
By designing a highly integrated, fully enclosed power conversion device, employing a high-temperature, high-pressure gaseous working fluid and Brayton cycle, and combining a turbine and a compressed air generator, the problem of low efficiency and installation in confined spaces in existing reactor power systems has been solved. This achieves efficient, compact power conversion and modular installation, ensuring zero leakage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NORTH CHINA ELECTRIC POWER UNIV
- Filing Date
- 2023-07-12
- Publication Date
- 2026-08-04
AI Technical Summary
Existing reactor power systems use steam as the working fluid, which suffers from low efficiency, large size, single purpose and high investment cost. Furthermore, traditional power conversion systems are difficult to modularize and integrate in confined spaces.
A highly integrated, fully enclosed power conversion device was designed, including a power conversion module and a heat exchanger module. It uses high-temperature and high-pressure gas as the working fluid and adopts the Brayton cycle. The turbine and the gas compressor generator are integrated into one unit. The integrated inner shell and the heat exchanger outer shell form two pressure barriers to achieve a fully enclosed structure, which simplifies the equipment layout and installation.
It achieves efficient and compact power conversion, simplifies equipment layout, adapts to modular installation in confined spaces, ensures zero leakage, and reduces the number of devices and space occupation.
Smart Images
Figure CN117108366B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of reactor power system technology, specifically relating to a highly integrated, fully enclosed integrated power conversion device. Background Technology
[0002] Currently, reactor power systems generally use steam as the working fluid, which has disadvantages such as low efficiency, large size, limited application, and high investment cost. New nuclear power plants using high-temperature, high-pressure gases (such as helium, xenon, and nitrogen) as the working fluid and employing the Brayton cycle offer advantages such as high efficiency, wide applicability, and high flexibility, representing an important direction for future nuclear energy development. The power conversion unit is one of the core components of the reactor system.
[0003] In certain applications, due to limited space and inconvenient on-site installation, small-sized, highly modular, and integrated devices are required. Ordinary power conversion systems have scattered equipment layouts and complex, interwoven pipeline distributions, making them unsuitable for such application scenarios, thus necessitating integrated power conversion devices. Summary of the Invention
[0004] The purpose of this invention is to provide a highly integrated, fully enclosed power conversion device, which has the advantages of small size, high integration, easy modular installation, and full enclosure and zero leakage, and is used in power systems that use high temperature and high pressure gas as the working fluid.
[0005] The technical solution of the present invention is as follows: a highly integrated, fully enclosed power conversion device, comprising a power conversion module and a heat exchanger module, wherein the power conversion module is installed in the heat exchanger module.
[0006] Preferably, the power conversion module includes a turbine, a compressor-generator, a main shaft, and an integrated inner shell. The turbine and the compressor-generator are coaxially connected via the main shaft and placed inside the integrated inner shell, with a hollow cylindrical heat exchanger surrounding the outside of the integrated inner shell.
[0007] Preferably, the turbine includes a turbine impeller, a high-pressure labyrinth seal, a dry gas seal, and an injection pipe. The turbine impeller, high-pressure labyrinth seal, and dry gas seal are sequentially mounted on the main shaft. The turbine impeller is located at the end of the main shaft. The high-pressure labyrinth seal and the dry gas seal are tightly attached to the inner side of the integrated inner shell. An injection pipe is opened on the integrated inner shell between the high-pressure labyrinth seal and the dry gas seal.
[0008] Preferably, the integrated compressor generator includes an overspeed clutch, an axial bearing, a radial bearing, a compressor impeller rotor, and a stator. The overspeed clutch, axial bearing, radial bearing, and compressor impeller rotor are sequentially mounted on the main shaft, and the stator is located at the inner end of the integrated inner shell.
[0009] Preferably, the compressor impeller rotor includes a compressor impeller, a permanent magnet assembly, and a fixed structure. The compressor impeller is connected to the fixed structure, and multiple permanent magnet assemblies are installed on the fixed structure.
[0010] Preferably, the integrated inner shell has an electrical penetration member on its side end.
[0011] Preferably, the heat exchanger module includes a precooler and a regenerator. One side of the precooler is connected to the regenerator, and a middle partition is provided between the other side of the precooler and the regenerator. Side holes are opened on the outer side of the middle partition. End caps are installed at both ends of the precooler and the regenerator, and the end caps have precooler holes and regenerator holes.
[0012] Preferably, the precooler, regenerator, and intermediate partition are all enclosed within two pressure barriers: an integrated inner shell and a heat exchanger outer shell.
[0013] The beneficial effects of this invention are as follows: This invention uses a highly integrated, fully enclosed power conversion device with high-temperature and high-pressure gas as the working fluid. It has a compact structure, high integration, and achieves modular installation. The hollow cylindrical heat exchanger covers the outside of the power conversion module, which greatly simplifies the piping between various devices and saves space. The integrated compressor and generator combines the compressor and generator into one unit, simplifying the number of devices. Furthermore, a new type of inorganic material is selected to address the potential corrosiveness of the high-temperature and high-pressure environment. The integrated inner shell and the heat exchanger outer shell form two fully enclosed pressure barriers, achieving zero leakage to the outside. Attached Figure Description
[0014] Figure 1 A schematic diagram of a highly integrated, fully enclosed power conversion device provided by the present invention;
[0015] Figure 2 This is a schematic diagram of a heat exchanger module;
[0016] Figure 3 This is a schematic diagram of the power conversion module.
[0017] In the diagram: 1 Power conversion module, 2 Heat exchanger module, 3 End cover, 4 Precooler channel, 5 Regenerator channel, 6 Precooler, 7 Intermediate partition, 8 Regenerator, 9 Side channel, 11 Turbine impeller, 12 Integrated inner shell, 13 Main shaft, 14 High-pressure labyrinth seal, 15 Gas extraction pipe, 16 Dry gas seal, 17 Overspeed clutch, 18 Axial bearing, 19 Radial bearing, 20 Compressor impeller, 21 Fixed structure, 22 Permanent magnet assembly, 23 Stator, 24 Electrical penetration component. Detailed Implementation
[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0019] like Figure 1As shown, the present invention provides a highly integrated, fully enclosed power conversion device, comprising a power conversion module 1 and a heat exchanger module 2. The power conversion module 1 is installed in the heat exchanger module 2.
[0020] like Figure 2 As shown, heat exchanger module 2 is a hollow cylindrical microchannel printed circuit board heat exchanger, which is compact, safe, and reliable. It includes a precooler 6 and a regenerator 8. One side of the precooler 6 is connected to the regenerator 8, and a middle partition 7 is provided between the other side of the precooler 6 and the regenerator 8. Side channels 9 are opened on the outer side of the middle partition 7. End caps 3 are installed at both ends of the precooler 6 and the regenerator 8. Two precooler channels 4 and two regenerator channels 5 are opened on the end caps 3. The two precooler channels 4 are connected to the inlet and outlet of the precooler 6, respectively, and the regenerator channels 5 are connected to the inlet and outlet of the regenerator 8, respectively. The precooler 6, regenerator 8, and middle partition 7 are all enclosed within two pressure barriers: an integrated inner shell 12 and a heat exchanger outer shell.
[0021] like Figure 3 As shown, the power conversion module 2 includes a turbine, a compressor-generator integrated unit, a main shaft 13, and an integrated inner shell 12. The turbine and the compressor-generator integrated unit are coaxially connected via the main shaft 13 and are placed inside the integrated inner shell 12, with a hollow cylindrical heat exchanger surrounding the outside of the integrated inner shell 12.
[0022] The turbine includes a turbine impeller 11, a high-pressure labyrinth seal 14, a dry gas seal 16, and an injection pipe 15. The turbine impeller 11, the high-pressure labyrinth seal 14, and the dry gas seal 16 are sequentially mounted on the main shaft 13. The turbine impeller 11 is located at the end of the main shaft 13. The high-pressure labyrinth seal 14 and the dry gas seal 16 are tightly attached to the inner side of the integrated inner shell 12. An injection pipe 15 is opened on the integrated inner shell 12 between the high-pressure labyrinth seal 14 and the dry gas seal 16.
[0023] The integrated compressor generator includes an overspeed clutch 17, an axial bearing 18, a radial bearing 19, a compressor impeller rotor, and a stator 23. The overspeed clutch 17, axial bearing 18, radial bearing 19, and compressor impeller rotor are sequentially mounted on the main shaft 13. The stator 23 is located at the inner end of the integrated inner shell 12. The compressor impeller rotor includes a compressor impeller 20, permanent magnet assemblies 22, and a fixing structure 21. The compressor impeller 20 is connected to the fixing structure 21, and multiple permanent magnet assemblies 22 are mounted on the fixing structure 21. Carbon fiber is used to fix the rotor permanent magnet assemblies 22, and novel inorganic materials such as glass fiber replace organic materials such as insulating rubber and resin to prevent corrosion. An electrical penetration component 24 is provided on the side end of the integrated inner shell 12. The electrical penetration component 24 uses a novel glass-metal sealing structure composed of Kovar alloy and borosilicate glass.
[0024] When the compressor generator is started, it acts as a prime mover to drive the compressor blades to rotate; during normal operation, it acts as a generator to produce electrical energy.
[0025] The working process of this invention is as follows:
[0026] During startup, the integrated compressor-generator acts as the prime mover, driving the compressor blades to rotate; during normal operation, the turbine acts as the prime mover, driving the integrated compressor-generator. The hollow cylindrical heat exchanger has side channels to facilitate connections between the various parts within the integrated inner shell and other external systems and equipment. The integrated inner shell and the heat exchanger outer shell form two pressure barriers for the device, ensuring a completely sealed system and zero leakage.
Claims
1. A highly integrated fully-enclosed integrated power conversion device, characterized by: It includes a power conversion module and a heat exchanger module, with the power conversion module installed in the heat exchanger module; The power conversion module includes a turbine, a compressor-generator, a main shaft, and an integrated inner shell. The turbine and the compressor-generator are coaxially connected via the main shaft and placed inside the integrated inner shell. A hollow cylindrical heat exchanger surrounds the outside of the integrated inner shell. The heat exchanger module includes a precooler and a regenerator. One side of the precooler is connected to the regenerator, and a middle partition is provided between the other side of the precooler and the regenerator. Side holes are opened on the outer side of the middle partition. End caps are installed at both ends of the precooler and the regenerator, and the end caps have precooler holes and regenerator holes. The precooler, regenerator, and intermediate partition are all enclosed within two pressure barriers: an integrated inner shell and a heat exchanger outer shell.
2. The highly integrated, fully enclosed power conversion device as described in claim 1, characterized in that: The turbine includes a turbine impeller, a high-pressure labyrinth seal, a dry gas seal, and an injection pipe. The turbine impeller, high-pressure labyrinth seal, and dry gas seal are sequentially mounted on the main shaft. The turbine impeller is located at the end of the main shaft. The high-pressure labyrinth seal and dry gas seal are tightly attached to the inner side of the integrated inner shell. An injection pipe is opened on the integrated inner shell between the high-pressure labyrinth seal and the dry gas seal.
3. The highly integrated, fully enclosed power conversion device as described in claim 1, characterized in that: The aforementioned integrated compressor generator includes an overspeed clutch, an axial bearing, a radial bearing, a compressor impeller rotor, and a stator. The overspeed clutch, axial bearing, radial bearing, and compressor impeller rotor are sequentially mounted on the main shaft, and the stator is located at the inner end of the integrated inner shell.
4. The highly integrated, fully enclosed power conversion device as described in claim 3, characterized in that: The compressor impeller rotor includes a compressor impeller, a permanent magnet assembly, and a fixed structure. The compressor impeller is connected to the fixed structure, and multiple permanent magnet assemblies are installed on the fixed structure.
5. The highly integrated, fully enclosed power conversion device as described in claim 3, characterized in that: An electrical penetration component is provided on the side end of the integrated inner shell.