热力透平2025，Vol.54Issue(1)：12-16,5.DOI:10.13707/j.cnki.31-1922/th.2025.01.003
600MW亚临界机组升参数改造关键技术
Key Retrofit Technology for Parameter Upgrading in 600 MW Subcritical Units
撒兰波 1叶兴柱 1李杨1
作者信息
- 1. 上海电气电站设备有限公司汽轮机厂,上海 200240
- 折叠
摘要
Abstract
With the increase of requirements for energy saving and emission reduction in China's thermal power industry,the retrofit technology of flow path in subcritical turbine has been significantly developed,and parameter upgrading is one of the main solutions for further improvement of economic benefits.The retrofit technology of parameter upgrading in 600 MW subcritical units was presented.With the main steam pressure unchanged,the temperatures of main steam and reheat steam were raised to 610℃and 620℃respectively.On the basis of the original regenerative steam extraction system,two stages of high-pressure regenerative steam extraction(the 1st extraction and 2nd extraction)were added to keep the feed water temperature at a high level.This scheme could further improve the operation economy under low load condition and could meet the requirements of full load denitrification of the boiler.The unit was equipped with regulating stage and steam supplement valve,and could operate in rated-sliding-rated mode.Once the rated load was reached,the four regulating valves would be fully opened,and once the rated load was exceeded,the No.2 high pressure heater would be gradually cut off,and the steam supplement valve would be opened to improve the power capacity.The proposed retrofit technology of parameter upgrading in subcritical units could realize efficient operation with wide load range and satisfying peak shaving capacity,and the heat rate under rated conditions could be reduced by about 4%—6%compared with conventional flow path retrofit.The research results can provide reference for subsequent project retrofit of high-temperature subcritical units.关键词
汽轮机改造/宽负荷/深度调峰/升参数/亚临界/回热抽汽/节能减排Key words
steam turbine retrofitting/wide load range/deep peak shaving/parameter upgrading/subcritical/regenerative steam extraction/energy saving and emission reduction分类
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撒兰波,叶兴柱,李杨..600MW亚临界机组升参数改造关键技术[J].热力透平,2025,54(1):12-16,5.
