• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2014, Vol. 35 ›› Issue (5): 94-98.doi: 10.3969/j.issn.1000-7229.2014.05.016

• 发电技术 • 上一篇    下一篇

直接空冷机组单风道地下进风数值分析

齐阳阳,吴红杰,刘辉   

  1. 电站设备状态检测与控制教育部重点实验室(华北电力大学),河北省保定市 071003
  • 出版日期:2014-05-01
  • 作者简介:齐阳阳(1987),男,硕士研究生,研究方向为直接空冷机组节能; 吴红杰(1985),女,硕士研究生,研究方向为直接空冷机组结构优化,E-mail:hbwaygirl@163.com; 刘辉(1987),男,硕士研究生,研究方向为电厂热力学分析。

Numerical Analysis of Direct Air-Cooling Unit with Single Duct Underground Ventilation

QI Yangyang, WU Hongjie, LIU Hui   

  1. Key Laboratory of Ministry of Education of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Baoding 071003, Hebei Province, China
  • Online:2014-05-01

摘要:

地上进风直接空冷机组受环境风影响,边缘风机出现热风回流和“倒灌”现象,使机组换热效率降低、凝汽器压力升高,为此提出了单风道地下进风的冷却方式。利用数值模拟Fluent软件,对某600 MW机组空冷岛外部流场进行了数值模拟,分析地下进风方式下风机通风量、机组换热效率和凝汽器压力受环境风影响情况,并与地上进风方式相比较。实验结果表明,采用地下进风方式极大地提高了凝汽器的换热效率,使凝汽器压力维持在较低且平稳的状态,保证机组安全经济运行。

关键词:  , 直接空冷机组, 地下进风, 空气流场, 环境风, 数值模拟

Abstract:

 Due to the influence of environmental wind on direct air-cooling unit with overground ventilation, the hot air recirculation and intrusion phenomenon occurred on the edge fan, which would cause the decrease of unit’s heat transfer efficiency and the increase of condenser pressure. Therefore, this paper proposed a cooling mode with single duct underground ventilation. The external flow field of air cooling island in a 600 MW unit was numerically simulated with using Fluent software. Then, the influence of environmental wind on fan ventilation, unit’s heat transfer efficiency and condenser pressure was analyzed under underground ventilation mode, and compared with that under overground ventilation mode. The experimental results show that the underground ventilation mode can greatly improve the heat exchanger efficiency of condenser, and make the condenser pressure maintain at low and stable state, which can ensure the safe and economic operation of units.

Key words:  direct air-cooling unit, underground ventilation, air flow field, environmental wind, numerical simulation