Configuration Optimization Design and Thermal Performance Analysis of Regenerative System for Double Reheat Units

DU Lingrui; WANG Chaoyang; LIU Ming; YAN Junjie

doi:10.7652/xjtuxb202610016

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Configuration Optimization Design and Thermal Performance Analysis of Regenerative System for Double Reheat Units

Special Topic Thermal-Fluid Analysis and System Optimization | 更新时间：2026-09-29

- Configuration Optimization Design and Thermal Performance Analysis of Regenerative System for Double Reheat Units
- Journal of Xi'an Jiaotong University Vol. 60, Issue 10, Pages: 184-196(2026)
- 作者机构：
  
  西安交通大学绿色氢电全国重点实验室，710049，西安
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202610016
  CLC： TM621
- Received：23 April 2026，
  
  Online First：10 June 2026，
  
  Published：10 October 2026
- 稿件说明：
移动端阅览
DU Lingrui, WANG Chaoyang, LIU Ming, et al. Configuration Optimization Design and Thermal Performance Analysis of Regenerative System for Double Reheat Units[J/OL]. Journal of Xi'an Jiaotong University,2026,60 (10):184-196. https://doi.org/10.7652/xjtuxb202610016.
DOI：

DU Lingrui, WANG Chaoyang, LIU Ming, et al. Configuration Optimization Design and Thermal Performance Analysis of Regenerative System for Double Reheat Units[J/OL]. Journal of Xi'an Jiaotong University,2026,60 (10):184-196. https://doi.org/10.7652/xjtuxb202610016. DOI：

摘要

针对二次再热机组回热抽汽过热度高、不可逆损失大、能效提升受限的问题，以660MW超超临界二次再热机组为研究对象，开展了回热系统构型优化设计与热力性能分析。依托Ebsilon热力仿真平台，从系统构型调整、耦合抽汽背压式汽轮机（BEST）、回热级数配比、再热参数匹配等维度设计了5种优化方案。在额定工况下对各方案进行热力性能对比分析，并针对最优方案开展全工况性能研究与参数优化，结合图像㶲分析法阐明BEST通过“先做功再放热”降低不可逆损失，实现抽汽能量梯级高效利用的机理。结果表明：采用12级回热系统、6级BEST的优化构型综合性能最优，相较原构型，汽轮机热耗率降低53.57kJ·kW

-1

·h

-1

，标准煤耗率降低1.93g·kW

-1

·h

-1

，汽轮机系统㶲效率上升0.79%，且在全工况下均存在节能潜力；优化再热参数后，系统热耗率进一步降低4.23kJ·kW

-1

·h

-1

，汽轮机热效率达51.14%，较原构型提升0.42%。研究结果可为二次再热燃煤发电机组的节能及BEST技术的工程化应用提供理论支撑。

Abstract

To address the issues of high superheat of regenerative extraction steam

large irreversible losses

and limited improvement in energy efficiency in double reheat units

this study selects a 660MW ultra-supercritical double reheat unit as the research object to conduct configuration optimization design and thermal performance analysis of the regenerative system. Utilizing the Ebsilon thermal simulation platform

five optimization schemes are designed from the aspects of system configuration adjustment

coupling a back pressure extraction steam turbine (BEST)

regenerative stage allocation

and reheat parameter matching. A comparative analysis of the thermal performance of each scheme is conducted under rated conditions

and full-range operating condition performance research and parameter optimization are carried out for the optimal scheme. Combined with the graphical exergy analysis method

the mechanism by which BEST reduces irreversible losses and achieves efficient cascade utilization of extraction steam energy through “doing work first and then releasing heat”is elucidated. The results show that the optimized configuration with a 12-stage regenerative system and a 6-stage BEST exhibits the best comprehensive performance. Compared with the original configuration

the turbine heat rate decreases by 53.57kJ·kW

-1

·h

-1

the standard coal consumption rate is reduced by 1.93g·

-1

·h

-1

and the exergy efficiency of the turbine system increases by 0.79%

demonstrating energy-saving potential under all operating conditions. After optimizing the reheat parameters

the system heat rate is further reduced by 4.23kJ·kW

-1

·h

-1

and the turbine thermal efficiency reaches 51.14%

which is 0.42% higher than that of the original configuration. The research results can provide theoretical support for the energy conservation of double reheat coal-fired power units and the engineering application of BEST technology.

关键词

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