Off-design performance of an ultra-supercritical power unit applying MC system

KAN Weimin; SONG Jinghui; ZHOU Luyao; ZHAO Shifei; XU Gang

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Off-design performance of an ultra-supercritical power unit applying MC system

Thermal Power Generation Vol. 43, Issue 7, Pages: 41-44(2014)

更新时间：2025-09-28

- Off-design performance of an ultra-supercritical power unit applying MC system
- 作者机构：
  
  1. 广东电网公司电力科学研究院
  2. 华北电力大学能源动力与机械工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621
- Published：2014
- 稿件说明：
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KAN Weimin, SONG Jinghui, ZHOU Luyao, et al. Off-design performance of an ultra-supercritical power unit applying MC system[J]. Thermal Power Generation, 2014, 43(7): 41-44.
DOI：

KAN Weimin, SONG Jinghui, ZHOU Luyao, et al. Off-design performance of an ultra-supercritical power unit applying MC system[J]. Thermal Power Generation, 2014, 43(7): 41-44. DOI：

摘要

基于常规超超临界机组热力系统(常规系统)

提出了取消中压缸抽汽

引入回热式小汽轮机抽汽的主循环(MC)系统的设计方案。以某超超临界1 000MW机组为例

利用EBSILION软件对常规系统和MC系统进行机组变工况下热力学计算分析和比较。结果表明:采用MC系统的机组

在设计工况下

机组发电效率比常规系统提高0.15%

发电煤耗降低0.92g/(kW·h);在30%负荷下

机组发电效率比常规系统提高0.24%

发电煤耗降低1.61g/(kW·h)。因此

采用MC系统的超超临界机组具有良好的变负荷特性

且更适合于低负荷工况下的高效经济运行。

Abstract

On the basis of thermal system in conventional ultra-supercritical power generation units

a design scheme for a master cycle(MC)system was proposed.In this scheme

the steam extraction from the intermediate pressure(IP)cylinder is replaced by extracting steam from an added regenerative small steam turbine.Taking an ultra-supercritical 1 000MW unit as the example

the EBSILION software was applied to conduct thermodynamic and economic analysis for the conventional system and MC system under different working conditions.The results show that:the power generation efficiency of the unit applying the MC system is 0.15%and 0.24%higher than that using the conventional system

and the coal consumption rate is 0.92g/(kW ·h)and1.61g/(kW·h)lower

under design condition and 30%load condition

respectively.Thus

the ultra-supercritical unit employing MC system is more suitable to work under low-load working conditions.

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