A compact arrangement method of a closed Brayton cycle power generation system

Abstract

A compact arrangement method of a closed Brayton cycle power generation system, wherein a main compressor, a re-compressor, a generator and a turbine are integrated in sequence and coaxially to form a core machine of the power generation system; analyzing a supercritical carbon dioxide flow path of the power generation system, arranging a low-temperature regenerator, a condenser and the core machine in sequence along an axial direction, and keeping the center lines of the three on a same straight line, so as to reduce the arrangement length of the carbon dioxide pipeline; after the coaxial arrangement of the low-temperature regenerator, the condenser and the core machine, the longitudinal dimensions of the three are equivalent to the longitudinal dimension of a high-temperature regenerator; finally, the high-temperature regenerator is arranged on the left side of the three, so that the pipeline length is reduced. The present application adopts a re-compression cycle Brayton power generation system, has high power generation efficiency, small volume, light weight and low noise, and is more suitable for an airborne heat and power conversion scheme. The present application makes the power generation system more compact and has smaller installation space through the reasonable arrangement of the components of the power generation system.

Description

Technical Field

[0001] This invention relates to the field of power generation system technology, specifically to a compact arrangement method for a closed Brayton cycle power generation system, which is a method for concentrating and compactly arranging key components of the power generation system, such as regenerators, compressors, turbines, generators, and condensers, together. Background Technology

[0002] Supercritical carbon dioxide (SCO2) Brayton cycle power generation technology uses supercritical carbon dioxide as the working fluid and generates electricity through expansion work based on the Brayton thermodynamic cycle. The SCO2 Brayton cycle exhibits unique physical properties near its critical point (7.3 MPa, 31.1℃), such as high specific heat capacity and high density. Its density, specific heat, and other state parameters undergo abrupt changes at the critical point, which can significantly reduce compressor power consumption, decrease the size of cycle components, and significantly improve cycle efficiency and power generation. Therefore, SCO2 cycle power generation technology has attracted considerable attention in both civilian and military (especially naval) fields due to its numerous advantages.

[0003] The SCO2 power generation system boasts numerous advantages, including improved power generation efficiency, energy savings, reduced system size and weight, and lower noise levels. Therefore, it is widely used in energy conversion fields, such as gas turbine power generation systems and aircraft and ship propulsion systems. Furthermore, the SCO2 Brayton cycle is also applied in large warship nuclear reactors, attracting significant attention and substantial research and development from countries like the United States.

[0004] Current research mostly focuses on thermal calculations and performance calculations of power generation systems, with less research on overall system layout and integration. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a compact layout method for a closed Brayton cycle power generation system that reduces system installation space.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A compact arrangement method for a closed Brayton cycle power generation system, wherein the closed Brayton cycle power generation system mainly includes a main compressor 11, a re-compressor 12, a turbine 13, a generator 14, a high-temperature regenerator 17, a low-temperature regenerator 16, and a condenser 15.

[0008] In the closed-loop Brayton cycle power generation system, the main compressor 11, recompressor 12, generator 14, and turbine 13 are integrated and coaxially arranged to form the core unit of the power generation system. The main compressor 11 and recompressor 12 employ centrifugal impeller structures, the turbine 13 employs a radial impeller structure, and the generator 14 is a permanent magnet generator. Figure 2 As shown.

[0009] In the closed-loop Brayton cycle power generation system, the high-temperature regenerator 17, low-temperature regenerator 16, and condenser 15 all employ printed circuit board heat exchangers. The high-temperature regenerator 17 is the largest, while the low-temperature regenerator 16 and condenser 15 are of similar size. Analyzing the supercritical carbon dioxide flow path of the power generation system, arranging the low-temperature regenerator 16, condenser 15, and core unit axially one by one, while keeping their centerlines aligned, reduces the length of the carbon dioxide piping. After the low-temperature regenerator 16, condenser 15, and core unit are arranged coaxially, their longitudinal dimensions are comparable to those of the high-temperature regenerator 17. Finally, placing the high-temperature regenerator 17 on the left side of the other three, with a compact arrangement, also reduces the piping length.

[0010] The power generation system operates as follows: high-temperature, high-pressure supercritical carbon dioxide enters turbine 13 and expands to perform work within it. The expanded carbon dioxide is then cooled sequentially by the low-pressure side of high-temperature regenerator 17 and the low-pressure side of low-temperature regenerator 16, and then splits into two streams. One stream is cooled by condenser 15 and enters main compressor 11. After being pressurized, the stream is further heated by low-temperature regenerator 16. The other stream directly enters re-compressor 12 for pressurization. The two streams mix and then enter high-temperature regenerator 17. The mixed stream is heated by high-temperature regenerator 17 and then enters heater 19. The heated stream then enters turbine 13 to form a closed loop.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. This invention adopts a recompression cycle Brayton power generation system, which has high power generation efficiency, small size, light weight, and low noise, making it more suitable for airborne thermoelectric conversion schemes.

[0013] 2. This invention makes the power generation system more compact and requires less installation space by rationally arranging the various components of the power generation system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the closed-loop Brayton cycle power generation system of the present invention.

[0015] Figure 2 This is a compact layout diagram of the closed-loop Brayton cycle power generation system of the present invention.

[0016] In the diagram: 11-Main compressor, 12-Recompressor, 13-Turbine, 14-Generator, 15-Condenser, 16-Low-temperature regenerator, 17-High-temperature regenerator, 18-Shaft, 19-Heater, 1-Heater inlet (high-temperature regenerator cold end outlet) carbon dioxide flow (referred to as flow A), 2-Heater outlet (turbine inlet) carbon dioxide flow (referred to as flow B), 3-Turbine outlet (high-temperature regenerator hot end inlet) carbon dioxide flow (referred to as flow C), 4-High-temperature regenerator hot end outlet (low-temperature regenerator cold end inlet) carbon dioxide flow (referred to as flow D), 5-Low-temperature regenerator cold end outlet carbon dioxide flow (referred to as flow D). E), 5a - Carbon dioxide flow at the hot end of the condenser (E1), 5b - Carbon dioxide flow at the inlet of the recompressor (E2), 6 - Carbon dioxide flow at the hot end of the condenser (inlet of the main compressor) (F), 7 - Carbon dioxide flow at the outlet of the main compressor (inlet of the cold end of the low-temperature regenerator) (G), 8a - Carbon dioxide flow at the outlet of the cold end of the low-temperature regenerator (H1), 8b - Carbon dioxide flow at the outlet of the recompressor (H2), 8 - Carbon dioxide flow at the cold end of the high-temperature regenerator (H), 9 - Carbon dioxide flow at the inlet of the cold end of the condenser, 10 - Carbon dioxide flow at the outlet of the cold end of the condenser. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1 The diagram shown is a structural diagram of the Brayton cycle power generation system of the present invention, which includes components such as a main compressor 11, a re-compressor 12, a turbine 13, a generator 14, a high-temperature regenerator 17, a low-temperature regenerator 16, and a condenser 15. The system workflow is as follows: The high-temperature, high-pressure carbon dioxide stream (stream B) from the outlet of heater 19 enters turbine 13, where it expands and performs work; the expanded carbon dioxide stream (stream C) enters high-temperature regenerator 17 and heats the mixed stream H from recompressor 12 and low-temperature regenerator 16, then flows to low-temperature regenerator 16 to heat stream G from main compressor 11. Stream C passes through high-temperature regenerator 17 and low-temperature regenerator 16 in sequence and is cooled to obtain stream D and stream E; stream E is divided into two streams before entering main compressor 11 and recompressor 12: stream E1 is cooled by condenser 15 to obtain stream F, which enters main compressor 11 and is compressed to obtain high-temperature, high-pressure stream G. Stream G then enters low-temperature regenerator 16 and is heated by stream D to obtain stream H1; then the other stream E2 directly enters recompressor 12 and is compressed to obtain stream H2. Then, flow H1 and flow H2 are mixed to obtain flow H, which enters the high-temperature regenerator 17 to obtain flow A. Then, flow A enters the heater 19 to obtain flow B. Finally, flow B enters the turbine 13 to complete the entire cycle process, forming a closed cycle.

[0019] like Figure 2As shown, the main compressor 11, re-compressor 12, turbine 13 and generator 14 in the power generation system are arranged coaxially to form the core machine of the power generation system. The main compressor 11 and re-compressor 12 adopt centrifugal impeller structure, the turbine 13 adopts centrifugal impeller structure, and the generator 14 is a permanent magnet generator.

[0020] like Figure 2 As shown, the high-temperature regenerator 17, low-temperature regenerator 16, and condenser 15 in the power generation system all use printed circuit board heat exchangers. The high-temperature regenerator 17 is the largest, while the low-temperature regenerator 16 and condenser 15 are of similar size. Arranging the low-temperature regenerator 16, condenser 15, and the core unit of the power generation system along their length, and keeping the centerlines of the core unit, condenser 15, and low-temperature regenerator 16 on the same straight line, reduces the length of the carbon dioxide pipeline. After arranging the core unit, condenser 15, and low-temperature regenerator 16, their longitudinal dimension, when coaxially arranged, is comparable to the longitudinal dimension of the high-temperature regenerator 17. Finally, placing the high-temperature regenerator 17 on the left side of the other three, in a compact arrangement, also reduces the pipeline length. Finally, the pipeline layout is carried out according to the carbon dioxide flow path of the power generation system, connecting all key components.

[0021] The implementation process of the compact layout method for a closed Brayton cycle power generation system of the present invention is as follows:

[0022] (1) The structural dimensions of each component are obtained based on the design results of the power generation system components. Among them, the high temperature regenerator 17 has the largest size, while the low temperature regenerator 16 and the condenser 15 have similar sizes.

[0023] (2) Based on the structural dimensions of each component and the CO2 circuit of the power generation system, the CO2 pipeline design and component arrangement are carried out. The condenser 15, the low-temperature regenerator 16 and the core machine are arranged one by one along the axial direction, and the center lines of the condenser 15, the low-temperature regenerator 16 and the core machine are kept on the same straight line. Finally, the high-temperature regenerator 17 is placed on the left side of the three and arranged compactly.

[0024] (3) Based on the component layout results and CO2 pipeline design results, complete the compact layout of the power generation system and verify the accuracy of the CO2 pipeline layout.

Claims

1. A compact layout method for a closed Brayton cycle power generation system, characterized in that, The closed-loop Brayton cycle power generation system mainly includes a main compressor (11), a re-compressor (12), a turbine (13), a generator (14), a high-temperature regenerator (17), a low-temperature regenerator (16), and a condenser (15). The main compressor (11), re-compressor (12), generator (14) and turbine (13) in the closed Brayton cycle power generation system are arranged coaxially in sequence to form the core machine of the power generation system. The main compressor (11) and re-compressor (12) adopt centrifugal impeller structure, the turbine (13) adopts centrifugal impeller structure, and the generator (14) is a permanent magnet generator. In the closed-loop Brayton cycle power generation system, the high-temperature regenerator (17), low-temperature regenerator (16), and condenser (15) all adopt printed circuit board heat exchangers. Among them, the high-temperature regenerator (17) is the largest, while the low-temperature regenerator (16) and condenser (15) are of similar size. Analyzing the supercritical carbon dioxide flow path of the power generation system, the low-temperature regenerator (16), condenser (15), and core machine are arranged one by one along the axial direction, and the center lines of the three are kept on the same straight line. After the low-temperature regenerator (16), condenser (15), and core machine are arranged coaxially, their longitudinal dimensions are similar to those of the high-temperature regenerator (17). Finally, the high-temperature regenerator (17) is placed on the left side of the three. The system workflow is as follows: The high-temperature, high-pressure carbon dioxide stream B from the heater (19) outlet enters the turbine (13) and expands to do work in the turbine (13); the expanded carbon dioxide stream C enters the high-temperature regenerator (17) and heats the mixed stream H from the re-compressor (12) and the low-temperature regenerator (16), and then flows to the low-temperature regenerator (16) to heat the stream G from the main compressor (11). Stream C passes through the high-temperature regenerator (17) and the low-temperature regenerator (16) in sequence and is cooled in sequence to obtain stream D and stream E; stream E enters the main compressor (11) and the re-compressor (12). Previously, it was divided into two streams: one stream E1 was cooled by the condenser (15) to obtain stream F, and stream F entered the main compressor (11) to be compressed to obtain high temperature and high pressure stream G. Stream G then entered the low temperature regenerator (16) and was heated by stream D to obtain stream H1; then the other stream E2 directly entered the compressor (12) to be compressed to obtain stream H2; then stream H1 and stream H2 were mixed to obtain stream H and entered the high temperature regenerator (17) to obtain stream A. Then stream A entered the heater (19) to obtain stream B. Finally, stream B entered the turbine (13) to complete the entire cycle process and form a closed cycle.

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