中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2015年
4期
898-905
,共8页
陈海平%仲雅娟%付浩然%孙见雨%郑伟
陳海平%仲雅娟%付浩然%孫見雨%鄭偉
진해평%중아연%부호연%손견우%정위
防风网%空冷岛%换热性能%数值模拟
防風網%空冷島%換熱性能%數值模擬
방풍망%공랭도%환열성능%수치모의
windshield%air-cooled island%heat exchange efficiency%numerical simulation
以国内某2×300 MW 直接空冷机组为例，利用FLUENT 软件，数值模拟空冷平台下部加装防风网对空冷岛换热性能的影响，并对比分析了加装防风网前后，空冷岛附近的空气流场以及温度场变化规律。结果表明：加装防风网能够提高大风天气下风机出力，抑制“热风回流”的产生，提高空冷岛换热性能。分别分析了在不同风速的炉后来风和侧边来风下，安装不同开孔率和网高的防风网对空冷岛换热效率的影响规律，发现加装开孔率为6%、13%防风网的空冷岛换热效率一般低于开孔率为25%、44%的换热效率；空冷岛换热效率随着防风网高度的增大呈现先上升后下降的趋势，最优防风网结构是开孔率为25%、网高为12 m。研究结果为直接空冷机组加装合适结构的防风网提供了理论依据。
以國內某2×300 MW 直接空冷機組為例，利用FLUENT 軟件，數值模擬空冷平檯下部加裝防風網對空冷島換熱性能的影響，併對比分析瞭加裝防風網前後，空冷島附近的空氣流場以及溫度場變化規律。結果錶明：加裝防風網能夠提高大風天氣下風機齣力，抑製“熱風迴流”的產生，提高空冷島換熱性能。分彆分析瞭在不同風速的爐後來風和側邊來風下，安裝不同開孔率和網高的防風網對空冷島換熱效率的影響規律，髮現加裝開孔率為6%、13%防風網的空冷島換熱效率一般低于開孔率為25%、44%的換熱效率；空冷島換熱效率隨著防風網高度的增大呈現先上升後下降的趨勢，最優防風網結構是開孔率為25%、網高為12 m。研究結果為直接空冷機組加裝閤適結構的防風網提供瞭理論依據。
이국내모2×300 MW 직접공랭궤조위례，이용FLUENT 연건，수치모의공랭평태하부가장방풍망대공랭도환열성능적영향，병대비분석료가장방풍망전후，공랭도부근적공기류장이급온도장변화규률。결과표명：가장방풍망능구제고대풍천기하풍궤출력，억제“열풍회류”적산생，제고공랭도환열성능。분별분석료재불동풍속적로후래풍화측변래풍하，안장불동개공솔화망고적방풍망대공랭도환열효솔적영향규률，발현가장개공솔위6%、13%방풍망적공랭도환열효솔일반저우개공솔위25%、44%적환열효솔；공랭도환열효솔수착방풍망고도적증대정현선상승후하강적추세，최우방풍망결구시개공솔위25%、망고위12 m。연구결과위직접공랭궤조가장합괄결구적방풍망제공료이론의거。
Taking one 2×300MW direct air-cooled units in domestic as an example, the influences of installing windshield down along air-cooled platform on the heat transfer performance of air-cooled island were numerically simulated using software FLUENT, and the variations of air flow field and temperature field near the air-cooled island after installing windshield were compared and analyzed respectively. The results show that the installation of windshield improves the air-cooled fan output in the condition of high wind speed, resists the process of hot air recirculation, and improves the heat transfer performance of the air-cooled island. Under different speed of the boiler side wind and the side-direction wind , the effect of different permeable rates and different heights of the windshield on heat transfer efficiency was further analyzed. The results show, the heat transfer efficiency of air-cooled island installed with windshield of which the permeable rate is 6% or 13% is generally lower than that when the permeable rate is 25% or 44%;With the increase of the windshield height, the heat transfer efficiency of air-cooled island increases first and then decreases, and the optimal structure of the windshield is that the permeable rate is 25% and the height is 12m. The research results provide some theoretical evidence for the optimization of the windshield of direct air-cooled units.
