发电技术 ›› 2018, Vol. 39 ›› Issue (5): 443-448.DOI: 10.12096/j.2096-4528.pgt.2018.068

• 火电及环境保护 • 上一篇    下一篇

机械通风直接空冷系统噪声预测与分析

崔超1(),赵允涛1,黄文慧2,杨立军2()   

  1. 1 中国大唐集团科技工程有限公司, 北京市 海淀区 100097
    2 华北电力大学能源动力与机械工程学院, 北京市 昌平区 102206
  • 收稿日期:2018-06-19 出版日期:2018-10-30 发布日期:2018-10-29
  • 作者简介:崔超(1980),男,硕士研究生,高级工程师,研究方向为电站空冷系统优化设计、大气污染物排放控制, cuic@cdte.com.cn|杨立军(1970),男,教授,研究方向为强化传热与电力节能,新能源利用技术,污染物和温室气体排放预测和控制技术, yanglj@ncepu.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(51476055)

Noise Prediction and Analysis of Mechanical Draft Direct Dry Cooling System

Chao CUI1(),Yuntao ZHAO1,Wenhui HUANG2,Lijun YANG2()   

  1. 1 China Datang Group Technology and Engineering Company Limited, Haidian District, Beijing 100097, China
    2 School of Energy Power and Mechanical Engineering, North China Electric Power University, Changping District, Beijing 102206, China
  • Received:2018-06-19 Published:2018-10-30 Online:2018-10-29
  • Supported by:
    National Natural Science Foundation of China(51476055)

摘要:

直接空冷系统采用大型轴流风机群对汽轮机排汽进行冷却,因此直冷系统噪声成为电站主要考虑的问题之一。该文利用计算流体软件Fluent对直接空冷单元和5×6规模的空冷岛进行流场模拟和噪声预估,并模拟增加消音墙后的空冷岛流场和噪声的变化情况。流场模拟的紊流模型采用大涡模拟(large eddy simulation,LES),噪声预估采用非稳态隐式求解。结果表明,在挡风墙内侧布置多孔吸声材料对空冷岛流场基本没有影响,但是它可以有效降低整个空冷岛的噪声水平,主要是降低了低频率的噪声。

关键词: 直接空冷, 风机, 流场模拟, 噪声预测, 降噪措施

Abstract:

Direct dry cooling system adopts large-scale axial flow fan group to cool exhaust steam of turbine. So the noise of direct dry cooling system becomes one of the hazards of power plants. By using computational fluid dynamics software Fluent, the simulation of flow field and noise forecast of direct dry cooling cell and system were performed in this paper. The changes of flow field and noise of ACCs (air-cooled steam condensers) were simulated after increasing the noise reduction wall. The large eddy simulation was applied to analyze the flow field. Noise forecast was proceeded by means of the unsteady and implicit solver. The results show that the porous sound-absorbing materials decorated inside the wind wall have no effect on the flow field of ACCs. But they could effectively reduce the noise level of ACCs, especially reducing the low frequency noise.

Key words: direct dry cooling, axial flow fan, flow field simulation, noise forecast, noise reduction measures