Key technologies of double reheat &amp;heat regeneration systems for large scale steam turbines

WANG Weiliang; LI Yongsheng

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Key technologies of double reheat &heat regeneration systems for large scale steam turbines

Thermal Power Generation Vol. 42, Issue 11, Pages: 49-53(2013)

更新时间：2025-09-28

- Key technologies of double reheat &heat regeneration systems for large scale steam turbines
- 作者机构：
  
  国电科学技术研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621
- Published：2013
- 稿件说明：
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WANG Weiliang, LI Yongsheng. Key technologies of double reheat &heat regeneration systems for large scale steam turbines[J]. Thermal Power Generation, 2013, 42(11): 49-53.
DOI：

WANG Weiliang, LI Yongsheng. Key technologies of double reheat &heat regeneration systems for large scale steam turbines[J]. Thermal Power Generation, 2013, 42(11): 49-53. DOI：

摘要

介绍了2次再热回热系统的结构形式及其系统所涉及的回热级数、外置蒸汽冷却器、再热点前加热器(HARP)、2次再热以及新型MC系统等关键技术。以超超临界800MW机组为例

对机组分别采用2次再热回热系统、MC系统及1次再热回热系统的经济性进行了比较。结果表明

机组2次再热与1次再热比较主蒸汽压力提高1.4MPa

主蒸汽温度降低5℃

机组热耗下降约226kJ/(kW·h)

热效率提高约1.40百分点;机组MC系统与1次再热系统相比主蒸汽压力提高3.8MPa、主蒸汽温度降低5℃、机组热耗下降约235kJ/(kW·h)、热效率提高约1.45百分点

与2次再热回热系统相比系统效率提高非常小

其技术优势的体现依赖于高背压小汽轮机效率的提高。

Abstract

The structure of the double reheat and heat regeneration system was presented.Key technologies including the number of regeneration stage

the external steam cooler

HARP

double reheat and the new MC system were discussed.Taking an ultra supercritical 800MW unit as the example

comparison between and among the unit applying the double reheat heat regeneration system and that combined with MC system and that applying single reheat heat regeneration system was performed.The results showed that

under the second reheat condition

the main steam pressure increased by 1.4MPa

while the main steam temperature dropped by 5℃

the unit heat consumption decreased by about 226kJ/(kW·h)

and the heat efficiency rose by 1.4%.Compared with the single reheat system

for the MC system

the main steam pressure increased by3.8MPa

while the main steam temperature dropped by 5℃

the unit heat consumption decreased by about 235kJ/(kW·h)

and the heat efficiency rose by about 1.45%.The system efficiency of the MC system increased little than that of the typical double reheat and heat regeneration system.However

the technical advantage of the MC system relies on further improvement of the high back pressure turbine.

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Key technologies of double reheat &heat regeneration systems for large scale steam turbines

DOI：

摘要

Abstract

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Keywords

references