Research on Performance Optimization of Coal-fired Power Generation Units Under Simultaneous Temperature and Pressure Variations at Low-load Conditions

YI Wencong; LIU Zefeng; XU Pengjiang; MA Tingshan; WANG Chaoyang; LIU Ming; YAN Junjie

doi:10.19805/j.cnki.jcspe.2026.250549

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Research on Performance Optimization of Coal-fired Power Generation Units Under Simultaneous Temperature and Pressure Variations at Low-load Conditions

更新时间：2026-07-16

- Research on Performance Optimization of Coal-fired Power Generation Units Under Simultaneous Temperature and Pressure Variations at Low-load Conditions
- Chinese Journal of Power Engineering Vol. 46, Issue 7, Pages: 121-131(2026)
- 作者机构：
  
  1. 西安交通大学动力工程多相流国家重点实验室,陕西,西安,710049
  2. 西安热工研究院有限公司高效灵活煤电及碳捕集利用封存全国重点实验室,陕西,西安,710053
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2026.250549
  CLC： TK227
- Published：2026
- 稿件说明：
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易文聪, 刘泽锋, 许朋江, 马汀山, 王朝阳, 刘明, 严俊杰. 燃煤发电机组低负荷温压同滑性能优化研究[J]. 动力工程学报, 2026, 46(7): 121-131.
易文聪, 刘泽锋, 许朋江, 马汀山, 王朝阳, 刘明, 严俊杰. 燃煤发电机组低负荷温压同滑性能优化研究[J]. 动力工程学报, 2026, 46(7): 121-131. DOI： 10.19805/j.cnki.jcspe.2026.250549.

DOI： 10.19805/j.cnki.jcspe.2026.250549

摘要

为降低燃煤机组深度调峰工况下的供电煤耗率

以660 MW机组为研究对象

建立了适应于低负荷工况的机理模型

并利用实际运行数据验证该模型的可靠性。基于热力学理论分析了低负荷工况机组的能耗分布特性

提出了通过调整工质流量来提升低负荷工况汽轮机相对内效率的策略。结果表明:与额定工况相比

低负荷工况下理论循环效率下降4.67%

锅炉效率下降0.43%

汽轮机相对内效率下降8.96%;对比调整流量前后发现

机组在低负荷工况下

温压同滑运行较原滑压运行具有更高的热经济性;以198 MW工况为例

调整流量后汽轮机相对内效率提高了1.57%

供电煤耗降低了1.137 g/(kW·h);在130、230、340 MW工况下

调整流量后供电煤耗分别降低了1.147、0.067、0.313 g/(kW·h)。本研究可为燃煤机组深度调峰下流量运行优化提供一定的参考。

Abstract

To reduce power consumption rate of coal-fired units during deep peak shaving operation

a mechanism model suitable for low-load conditions was established based on a 660 MW unit as the research object. The reliability of the model was verified using actual operation data. Based on thermodynamic theory

the energy consumption distribution characteristics of the unit under low-load conditions were analyzed

and the strategy was proposed to improve the relative internal efficiency of the steam turbine under low-load conditions by adjusting the working fluid flow rate. Results show that compared with the rated condition

the theoretical cycle efficiency decreases by 4.67% under the low-load condition

the boiler efficiency decreases by 0.43%

and the relative internal efficiency of the steam turbine decreases by 8.96%. After comparing before and after flow adjustment

it is found that the unit operates with simultaneous temperature and pressure changes under low-load conditions

which has higher thermal economy than the original sliding pressure operation. Taking 198 MW as an example

after adjusting the flow rate

the relative internal efficiency of the steam turbine increases by 1.57%

and the power consumption rate decreases by 1.137 g/(kW·h). Under the operating conditions of 130

230 and 340 MW for the unit

after adjusting the flow rate

the power consumption rates are reduced by 1.147

0.067 and 0.313 g/(kW·h)

respectively. The study can provide certain reference for optimizing the flow rate operation of coal-fired units during deep peak shaving conditions.

关键词

Keywords

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