• 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 (11): 127-131.doi: 10.3969/j.issn.1000-7229.2014.11.022

• 发电技术 • 上一篇    下一篇

发电厂冷却塔弧形布置填料层的特性分析

赵文升,肖龙跃,丁晓冬   

  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),河北省保定市 071003
  • 出版日期:2014-11-01
  • 作者简介:赵文升(1969),男,副教授,主要从事汽轮机设备状态监测与运行优化、直接空冷系统的结构优化等研究工作; 肖龙跃(1988),男,硕士研究生,主要从事湿式冷却塔填料的研究; 丁晓冬(1990),男,硕士研究生,主要从事热电厂热经济性、热电负荷分配算法及其分配系统的研究。

 
Characteristic Analysis on Arc-Shaped Packing Layer of Cooling Tower in Power Plant

ZHAO Wensheng, XIAO Longyue, DING Xiaodong   

  1. Ministry of Education Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Baoding 071003, Hebei Province, China
  • Online:2014-11-01

摘要:

填料是自然通风湿式冷却塔最主要的换热部分,其换热量占冷却塔总换热量的60%~70%,具有很大的节能潜力。针对填料层的布置方式,提出了用弧形填料层替代传统水平布置填料层的构想,并借助Fluent模拟软件,建立了湿式冷却塔弧形填料层的传热传质模型。研究对比了不同弧度的填料层布置对冷却塔热力性能的影响,并计算分析了不同环境侧风下,弧形填料层冷却塔内空气流场、出塔水温等参数的变化。研究结果表明:与传统的水平布置相比,弧形布置填料层增加了一部分换热面积,改善了雨区空气流场,从而增加了冷却塔的换热量,使冷却塔抽力增加,出塔水温降低;在环境侧风条件下,这种改善效果更加显著,以填料层弧度0.12 rad为例,当环境风速6 m/s时,出塔水温最高可降低0.36 ℃。

关键词: 冷却塔, 弧形填料层, 弧度, 侧风, 数值模拟

Abstract:

 Packing is the most important part of the heat exchanger in natural draft wet cooling tower, which accounts for 60%-70% of the total heat transfer, so it has a great potential in energy saving. According to the arrangement of packing layer, this paper put forward the idea that used arc-shaped packing layer instead of traditional horizontal packing layer; established a heat and mass transfer model for the arc-shaped packing layer in wet cooling tower with using simulation software Fluent. Then, the impact of packing layer arrangement with different radians on the thermal performance of cooling tower was studied and compared; the relevant parameters’ changes of arc-shaped packing layer in wet cooling tower, such as air flow field and outlet water temperature, were calculated and analyzed under different natural crosswind conditions. The research results show that: the arc-shaped packing layer can increase the heat exchange area, improve the air flow field in rain zone, thus increase the heat exchange quantity and pumping power of cooling tower, and reduce the outlet water temperature; this improvement is more significant under natural crosswind conditions. In the case of 0.12 rad packing layer, when the natural wind speed is 6 m/s, the outlet water temperature can be reduced up to 0.36 ℃.

Key words: cooling tower, arc-shaped packing layer, radian, crosswind, numerical simulation