650℃一次再热超超临界燃煤发电机组设计优化

doi:10.3901/JME.2022.22.416

机械工程学报 ›› 2022, Vol. 58 ›› Issue (22): 416-425.doi: 10.3901/JME.2022.22.416

• 可再生能源与工程热物理 • 上一篇下一篇

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650℃一次再热超超临界燃煤发电机组设计优化

王婧, 段立强, 杨名

华北电力大学能源动力与机械工程学院北京 102206

收稿日期:2022-04-08 修回日期:2022-07-06 出版日期:2022-11-20 发布日期:2023-02-07
通讯作者: 段立强(通信作者),男,1973年出生,博士,教授,博士研究生导师。主要研究方向为先进能量系统集成与优化。E-mail:dlq@ncepu.edu.cn
作者简介:王婧,女,1984年出生,博士研究生。主要研究方向为高参数超超临界燃煤机组系统优化。E-mail:1182102005@ncepu.net.cn
基金资助:
国家重点研发计划资助项目(2017YFB0602101)

Design Optimization of 650 ℃ Ultra-supercritical Coal-fired Power Generation System with Single Reheat System

WANG Jing, DUAN Li-qiang, YANG Ming

School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206

Received:2022-04-08 Revised:2022-07-06 Online:2022-11-20 Published:2023-02-07

摘要/Abstract

摘要： 针对650℃一次再热超超临界燃煤发电机组热力系统抽汽过热度较高、空气预热器换热温差较大的问题,在650℃基准机组基础上提出加装2级前置式蒸汽冷却器(Outside steam coolers,OSCs)(方案1)和采用前置式空气预热器+OSCs(方案2)进行性能对比研究。通过Ebsilon建模,采用单耗分析法对比了650℃一次再热机组在变工况下的能耗分布情况。结果表明:650℃一次再热机组发电煤耗比600℃二次再热机组降低10.67g·(kW·h)^-1,比700℃一次再热机组高9.77g·(kW·h)^-1(100%THA),节煤效果显著。650℃一次再热不同优化方案中,方案2在各工况下性能均优于方案1和基准机组,方案2发电煤耗246.71g·(kW·h)^-1(100%THA),比方案1降低1.99g·(kW·h)^-1,比基准机组降低3.32g·(kW·h)^-1,在低负荷下仍具有良好的节煤效果。

关键词: 650℃, 先进超超临界(A-USC), 一次再热, 抽汽过热度, 外置式蒸汽冷却器(OSC), 单耗分析

Abstract: In order to solve the problems of high superheat degrees of regenerative extraction steams and large heat transfer temperature differences of air preheater in 650 ℃ single reheat advanced ultra-supercritical(A-USC) coal-fired power generation system, two optimized schemes(scheme 1 is integrated with two stages outside steam coolers(OSCs), while scheme 2 is simultaneously integrated with both OSCs and fronted air preheater(FAH) are proposed and compared on the base of the principle of energy level matching. The 650 ℃ A-USC coal-fired power generation system models are built by the Ebsilon software and the energy consumptions under off-design conditions are analysed with the unit consumption analysis method. The results show that the coal consumption of the 650 ℃ single reheat unit has remarkable coal saving effect compared with the 600 ℃ double reheat unit.The standard coal consumption of 650 ℃ single reheat unit is 10.67g·(kW·h)^-1 lower than that of the 600 ℃ double reheat unit, and 9.77% higher than that of the 700 ℃ single reheat unit(100%THA). The standard power generation coal consumptions of optimized scheme 2 are lower than those of scheme 1 and reference system under any working condition. The standard power generation coal consumption of scheme 2 is 246.71 g·(kW·h)^-1(100%THA), 3.32 g·(kW·h)^-1 lower than that of the reference system and 1.99 g·(kW·h)^-1 lower than that of the scheme 1.

Key words: 650 ℃, Advanced ultra-supercritical(A-USC), single reheat cycle, extraction steam superheat, OSC, unit consumption analysis

中图分类号:

TK212

王婧, 段立强, 杨名. 650℃一次再热超超临界燃煤发电机组设计优化[J]. 机械工程学报, 2022, 58(22): 416-425.

WANG Jing, DUAN Li-qiang, YANG Ming. Design Optimization of 650 ℃ Ultra-supercritical Coal-fired Power Generation System with Single Reheat System[J]. Journal of Mechanical Engineering, 2022, 58(22): 416-425.

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650℃一次再热超超临界燃煤发电机组设计优化

Design Optimization of 650 ℃ Ultra-supercritical Coal-fired Power Generation System with Single Reheat System

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