• 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 ›› 2015, Vol. 36 ›› Issue (6): 7-13.doi: 10.3969/j.issn.1000-7229.2015.06.002

• 理论研究 • 上一篇    下一篇

环境风作用下2×1 000 MW直接空冷机组空冷岛布局

肖烈晖,杜小泽,杨立军,席新铭   

  1. 电站设备状态监测与控制教育部重点实验室(华北电力大学),北京市 102206
  • 出版日期:2015-06-01
  • 作者简介:肖烈晖(1991),男,博士研究生,主要从事电站直接空冷系统优化等研究 杜小泽(1970),男,博士,教授,通讯作者,主要从事强化传热与电力节能、新能源发电等研究 杨立军(1970),男,博士,教授,主要从事火力发电空冷技术等研究 席新铭(1979),男,硕士,工程师,主要从事火力发电空冷技术等研究
  • 基金资助:

    国家重点基础研究发展计划项目(973项目)(2015CB251503)。

Air-Cooling Condenser Layout of 2×1 000 MW Direct Air-Cooled Units under Effect of Ambient Natural Wind

XIAO Liehui, DU Xiaoze, YANG Lijun, XI Xinming   

  1. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric  Power University, Beijing 102206, China
  • Online:2015-06-01
  • Supported by:

    Project Supported by National Basic Research Program of China (973 Program)(2015CB251503).

摘要:

单机容量达到百万kW的直接空冷火电机组空冷岛具有庞大的体积和更多的空冷单元,环境风导致的系统性能空间分布不均匀性更为明显。空冷岛的结构与布局优化,为百万kW空冷机组应对环境风不利影响提供了可行的技术途径。针对2×1 000 MW直接空冷机组,建立物理数学模型,考虑环境自然风和空冷单元轴流风机输运空气流的耦合作用,采用数值模拟方法,获得空气侧流场和温度场的三维分布。特别针对实际运行中最为不利的锅炉后来风,在不同风速,以及空冷岛和主厂房不同距离条件下,从机理上解释空冷岛冷却通风流量和换热性能的变化规律。结果表明:随着环境风速增加,空冷岛的换热能力降低;距离增大,随风速增加换热性能恶化的趋势更为显著;环境风速大于6 m/s时,距离越大,热风回流率越高;相比于其他更大距离的布置方式,距离15 m布置方式流动换热性能更好;环境风速较大的情况下,紧密的空冷电站建筑布局,更有利于抵御大风的不利影响。

关键词: 直接空冷, 空冷岛, 流动传热特性, 距离, 热风回流率

Abstract:

Air-cooled condensers (ACCs) of direct air-cooled plant with unit capacity of 1 000 MW have huge size and more cells, and the inhomogeneity of system performance in space distribution by ambient wind is obvious. The optimization of the structure and layout can provide feasible technical approach for 1 000 MW ACCs to replay to ambient wind. On the basis of 2×1 000 MW direct air-cooled units, this paper constructed physical and mathematical models with considering the coupling effect of ambient wind and air flow from unit fans, and presented the three-dimensional distribution of flow and temperature fields by using numerical simulation method. Then the variation mechanism of the cooling ventilation flow rate and heat transfer performance of ACCs with wind speed and distance between ACCs and the main buildings was explained, especially for the wind from boiler house which was most unfavorable. The results show that the heat thermo-flow performance of ACCs is decreased with the increase of the wind speed. With the increase of wind speed, the heat capacity decreases more rapidly when the distance between ACCs and the main buildings increases. When the wind speed is over 6 m/s, the exhaust plume recirculation flow ratio increases with the distance increases; the heat transfer performance of 15 m is better than other more lager distance. Therefore it’s benefit to resist adverse effect by strong wind with tight air-cooled plant layout at high wind speed.

Key words:  direct air-cooled, air-cooled condenser (ACC), thermo-flow performances, distance, exhaust plume recirculation flow ratio

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