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2025 , Vol. 34 >Issue 1: 159 - 175

DOI: https://doi.org/10.1007/s11630-024-1994-0

Impact of Startup Strategy and Buffer Tank Volume on the Compressor Inlet State for a 3-MW sCO2 Brayton Cycle

  • ZHAO Decai ,
  • WANG Bo
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  • 1. Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics (IET), Chinese Academy of Sciences (CAS), Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China

网络出版日期: 2025-01-09

基金资助

This work is supported by the National Science and Technology Major Project of China (Grant No. 2017-I-0002-0002) and Major National Science And Technology Infrastructure “High-Efficiency and Low-Carbon Gas Turbine Research Facility” (Grant No. 2017-000052-73-01-001569).

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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Impact of Startup Strategy and Buffer Tank Volume on the Compressor Inlet State for a 3-MW sCO2 Brayton Cycle

  • ZHAO Decai ,
  • WANG Bo
Expand
  • 1. Key Laboratory of Advanced Energy and Power, Institute of Engineering Thermophysics (IET), Chinese Academy of Sciences (CAS), Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China

Online published: 2025-01-09

Supported by

This work is supported by the National Science and Technology Major Project of China (Grant No. 2017-I-0002-0002) and Major National Science And Technology Infrastructure “High-Efficiency and Low-Carbon Gas Turbine Research Facility” (Grant No. 2017-000052-73-01-001569).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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摘要

超临界二氧化碳（sCO2）布雷顿循环系统因其高效率、结构紧凑和良好的热源适应性等优势，已逐渐成为一种新兴的、极具潜力的热功转换方式。基于国家重大基础设施项目“高效低碳燃气轮机试验装置”下属的循环输出功率接近3MW的sCO2布雷顿循环试验台，建立了简单回热循环系统的较为详细的动态仿真模型，研究了系统在启动过程中采用不同启动策略和不同缓冲罐容积时的动态响应特性。研究结果表明，缓冲罐容积越小，启动过程中压缩机入口参数波动越快、振幅越明显。如压缩机入口密度的允许相对偏差限制不超过5%，那么缓冲罐容积与整个闭式循环容积占比不应低于36.8%；透平旁路启动时，采用同时升温、升转速的策略可以有效减小压缩机入口参数的波动、帮助更快地达到稳定；为减少旁路切换时参数的波动，给出了旁路切换时透平旁路阀（TBV）和透平主调节阀（MGV）开度的匹配表。研究结果可为试验台后续的调试和运行提供一定参考。

关键词： sCO2 Brayton cycle; dynamic model; buffer tank; startup strategy; dynamic characteristic

本文引用格式

ZHAO Decai , WANG Bo . Impact of Startup Strategy and Buffer Tank Volume on the Compressor Inlet State for a 3-MW sCO2 Brayton Cycle[J]. 热科学学报, 2025 , 34(1) : 159 -175 . DOI: 10.1007/s11630-024-1994-0

Abstract

The supercritical carbon dioxide (sCO2) Brayton cycle system has become an emerging and highly promising method of thermal power conversion due to its efficiency advantage, system compactness, and excellent adaptability of the heat sources. For the low carbon sCO2 Brayton cycle testbed with cycle output power approaching 3 MW, a relatively detailed dynamic simulation model of the entire system is constructed to explore the dynamic response characteristics of the system with different startup strategies and different buffer tank volumes during the startup process. The simulation results indicate that the smaller the volume of the buffer tank, the more rapid and obvious the parameter fluctuation in the buffer tank during the startup. Assuming the allowable relative deviation limit of density is 5%, then the ratio of the buffer tank volume to the volume of the entire closed loop should not be lower than 36.80%. The strategy of simultaneous temperature and speed increase during turbine bypass start can effectively reduce the fluctuation of compressor inlet parameters and reach the steady-state more quickly. This paper provides the recommended matching table for the opening of the turbine bypass valve (TBV) and the main regulating valve (MGV) to reduce the parameter fluctuation during the bypass switching. The effectiveness of the proposed turbine bypass and bypass switching startup strategy is verified by simulation, which may be used as a reference for test bench’s future debugging and operation.

Key words： sCO2 Brayton cycle; dynamic model; buffer tank; startup strategy; dynamic characteristic

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