侧风条件下带消能导流装置的直接空冷岛冬季冻结风险模拟研究  

Simulation Study on Winter Freezing Risk of Direct Air-cooling Island with Energy Dissipation Diversion Device under Crosswind Condition

作　　者：陈鹏 李高潮[2] 吕国东 师进文[4] CHEN Peng;LI Gao-chao;LYU Guo-dong;SHI Jin-wen(State Grid Energy Hami Coal Power Co.,Ltd,Hami,China,839099;Xi'an Thermal Power Research Institute Co.,Ltd,Xifan,China,710054;SPIC Shanxi Aluminium Co.,Ltd,Xinzhou,China,034100;State Key Laboratory of Multiphase Flow in Power Engineering,Xiran,China,710049)

机构地区：[1]国网能源哈密煤电有限公司,新疆哈密839099 [2]西安热工研究院有限公司,陕西西安710054 [3]国家电投集团山西铝业有限公司,山西忻州034100 [4]西安交通大学动力工程多相流国家重点实验室,陕西西安710049

出　　处：《热能动力工程》2022年第6期105-113,共9页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点研发计划(2019YFB1505403)。

摘　　要：哈密某电厂在其空冷岛中使用了一种新型消能导流装置来抵抗侧风影响、稳定机组背压。然而,该电厂冬季空冷单元散热管束冻结的情况依然存在。为了探究该装置对空冷岛冬季防冻的影响,利用Fluent软件对该电厂冬季大风时空冷岛的流动传热特性及各空冷单元的冻结风险进行了模拟研究。研究表明:空冷岛“消能导流装置”整体上对空冷单元的防冻起负面作用;在冬季大风条件下该装置迎风侧空冷单元的散热量平均超出警戒值27%以上,最高达到50%;消能导流装置主要通过提升轴流风机空气流速来增加对应空冷单元的换热量,该装置迎风侧空冷单元轴流风机的轴向空气流速甚至能达到与环境侧风相同的水平,这导致对应空冷单元换热量激增,更容易出现冻结事故;大风条件下该装置在空冷岛下方形成的高压区域分布并不均匀,临近主厂房与相邻空冷岛一侧的高压区域压力更高、面积更大,这些区域空冷单元的冻结风险更高。Hami power plant used a new type of"energy dissipation diversion device"in its air-cooling island to resist the crosswind influence and stabilize unit back pressure.However,the cooling tube bundle in the air-cooling unit of the power plant still freezed in winter.In order to explore the effect of the device on the anti-freezing of the air-cooling island in winter,the simulation research on the flow and heat transfer characteristics of air-cooling island and the freezing risk of each air-cooling unit under the winter gale condition was carried out by using the Fluent software.The research result shows that the"energy dissipation diversion device"of air-cooling island has a negative effect on anti-freezing of air-cooling unit integrally.Under the winter gale condition,the heat dissipation of the air-cooling units on the windward side of the device is about 27%higher than the warning value on average,with the maximum value of more than 50%.The"energy dissipation diversion device"mainly increases the heat transfer of the corresponding air-cooling unit by increasing the air velocity of the axial flow fan.The axial air velocity of the axial flow fan in the air-cooling units at the windward side of the device can even reach to the same level as the ambient crosswind,which leads to a surge of the heat exchange of corresponding air-cooling units,and makes it easier to be frozen.Under the strong wind conditions,the high-pressure area formed by the device under the air-cooling island is not evenly distributed.The high-pressure area near the main plant and adjacent air-cooling island has higher pressure and larger area,and the air-cooling units in these areas have higher freezing risk.

关 键 词：空冷岛 消能导流装置 流动传热特性 冬季冻结风险 模拟研究 

分 类 号：TK121[动力工程及工程热物理—工程热物理]