EN大型燃煤电站汽轮机排汽通道结构优化研究
Study on Structure Optimization of Exhaust Steam Passage of Steam Turbine in Large Coal-fired Power Station
- 发电技术 2021年42卷第4期 页码：464-472
- 作者机构：
华北电力大学能源动力与机械工程学院, 北京市 昌平区 102206
- 作者简介：
[ "王玉亭(1997), 男, 本科生, 研究方向为火电厂冷端综合优化, 18678515021@163.com" ]
[ "陈彦奇(1998), 男, 本科生, 研究方向为火电厂冷端综合优化" ]
徐钢(1978), 男, 博士, 教授, 研究方向为能源动力系统优化与节能、污染物控制及温室气体减排, 本文通信作者, xg2008@ncepu.edu.cn
[ "陈衡(1989), 男, 博士, 副教授, 研究方向为多能互补系统集成与优化" ]
- 基金信息：国家自然科学基金项目(51806062);中央高校基本科研业务费项目(2020MS006)
DOI：10.12096/j.2096-4528.pgt.21067
中图分类号： TK05收稿：2021-05-28，
纸质出版：2021-08-31
- 稿件说明：
移动端阅览
王玉亭, 陈彦奇, 徐钢, 等. 大型燃煤电站汽轮机排汽通道结构优化研究[J]. 发电技术, 2021,42(4):464-472.
Yuting WANG, Yanqi CHEN, Gang XU, et al. Study on Structure Optimization of Exhaust Steam Passage of Steam Turbine in Large Coal-fired Power Station[J]. Power Generation Technology, 2021, 42(4): 464-472.
王玉亭, 陈彦奇, 徐钢, 等. 大型燃煤电站汽轮机排汽通道结构优化研究[J]. 发电技术, 2021,42(4):464-472. DOI： 10.12096/j.2096-4528.pgt.21067.
Yuting WANG, Yanqi CHEN, Gang XU, et al. Study on Structure Optimization of Exhaust Steam Passage of Steam Turbine in Large Coal-fired Power Station[J]. Power Generation Technology, 2021, 42(4): 464-472. DOI： 10.12096/j.2096-4528.pgt.21067.
摘要
针对河北某电厂600 MW湿冷机组，运用ANSYS Fluent软件对汽轮机排汽通道流场进行数值模拟。研究发现：在原设计下，由于排汽缸轴向排汽及凝汽器接颈存在扩散角，排汽通道内出现了较大的低速漩涡区域，对凝汽器换热性能具有负面作用，而给水泵汽轮机排汽对低速漩涡区域具有一定的补充作用，能够一定程度上改善流场。针对这种现象，通过设计导流结构，对排汽通道流场进行了优化，结果表明：经过流场优化后，机组排汽在主凝结区最上层管束平面处的流速均匀性得到了显著提升，从而有利于提高凝汽器换热系数、降低机组背压、提升机组发电效率。
Abstract
For a 600 MW wet-cooled unit of a power plant in Hebei province
ANSYS Fluent software was used to numerically simulate the flow field of the steam turbine exhaust passage. It was found that under the original design
due to the axial exhaust steam of the exhaust cylinder and the diffusion angle of the condenser neck
a large low-speed vortex area appeared in the exhaust steam passage
which had a negative effect on the heat transfer performance of the condenser. The exhaust steam of the feed water pump steam turbine had a certain supplementary effect on the low-speed vortex area and could improve the flow field to a certain extent. Aiming at this phenomenon
the exhaust passage flow field was optimized through the design of diversion structures. The results show that after optimizing the flow field
the crew exhaust steam condensed in the main area of the upper tube bundle planar velocity uniformity has been significantly increased
which is benefit to improve the condenser heat transfer coefficient
reduce the unit back pressure
and promote the efficiency of generating units.
关键词
Keywords
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