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1、第40卷第6期華北電力大學(xué)學(xué)報(bào)Vo1.40.No.62013年11月JournalofNoahChinaElectricPowerUniversityNov.,2013doi:10.3969/j.ISSN.1007—2691.2013.06.17不同環(huán)境溫度下濕式冷卻塔防凍規(guī)律的數(shù)值研究李永華,潘昌遠(yuǎn),甄海軍,李燕芳(華北電力大學(xué)能源動(dòng)力與機(jī)械工程學(xué)院,河北保定071003)摘要:基于自然通風(fēng)冷卻塔的相關(guān)理論和Fluent軟件,建立了冷卻塔的傳熱傳質(zhì)數(shù)學(xué)模型,對(duì)環(huán)境溫度為263.15K,256.15
2、K,250.15K,風(fēng)速為2m/s,4m/s,6m/s,8m/s,加裝不同層數(shù)擋風(fēng)板時(shí),某600MW機(jī)組冷卻塔內(nèi)空氣溫度場(chǎng)、塔內(nèi)最低水滴溫度和最低空氣溫度進(jìn)行了模擬,結(jié)果表明:(1)在環(huán)境溫度為250.15K時(shí),低風(fēng)速(小于4m/s)下塔內(nèi)的背風(fēng)面區(qū)域空氣溫度較高,隨著風(fēng)速的增加,高溫區(qū)逐漸向迎風(fēng)側(cè)轉(zhuǎn)移。(2)隨著環(huán)境溫度的下降,冷卻塔內(nèi)的最低水滴溫度和最低空氣溫度降低,尤其是在環(huán)境溫度為250.15K、風(fēng)速為8m/s,塔內(nèi)最低水溫和最低空氣溫度下降最為明顯。(3)當(dāng)環(huán)境溫度分別為263.15K,2
3、56.15K,250.15K,風(fēng)速為2m/s和4m/s時(shí),掛1,1,4層和0,1,l擋風(fēng)板可有效防止塔內(nèi)結(jié)冰;當(dāng)環(huán)境溫度分別為263.15K,256.15K,250.15K,風(fēng)速為6m/s和8m/s時(shí),掛l,2,3層和1,4,5擋風(fēng)板可有效防止塔內(nèi)結(jié)冰。關(guān)鍵詞:冷卻塔;擋風(fēng)板;防結(jié)冰;熱力特性;數(shù)值模擬中圖分類號(hào):TK264.1文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1007—2691(2013)06—0101—08Numericalstudyontheanti—icinglawofwetcoolingtoweru
4、ndertheinfluenceofenvironmenttemperatureLIYong—hua,PANChang-yuan,ZHENHai—jun,LIYan-fang(SchoolofEnergyPowerandMechanicalEn~neering,NorthChinaElectricPowerUniversity,Baoding071003,China)Abstract:Basedontherelatednaturaldraftcoolingtowertheoryandthesofto
5、fFluent.a(chǎn)heatandmasstransfermod—elofthecoolingtowerhadbeenbuilt.Theairtemperaturefield.theminimumwatertemperatureandtheminimumairtemperatureinthecoolingtowerofa600MWunithadbeensimulatedwhentheenvironmenttemperaturesrespectivelywere263.15K,256.15K,250.1
6、5K,thewindspeedsrespectivelywere2m/s,4m/s,6m/sand8m/s。andthedifferentlayersofthewindshieldboardinstalled.Theresultsindicatedthat:(1)Whentheenvironmenttemperatureis250.15K,whilethewindspeedwaslowerthan4m/s,theairtemperatureintheleewardofcoolingtowerwash
7、igher,andthehighertemperaturezonesmovedtothewindwardofthecoolingtowerwiththeincreasingofwindspeed.(2)Theminimumwatertemperatureandtheminimumairtemperaturereducedwiththedropoftheenvironmenttempera—ture.Especiallywhentheenvironmenttemperaturewas250.15Kan
8、dthewindspeedwas8m/s,theminimumwatertemperatureandtheminimumairtemperaturedecreasedthemostobvious.(3)Whentheenvironmenttemperaturesrespectivelywere263.15K,256.15Kand250.15Kandthewindspeedswere2m/sand4m/s,theoptimallayersofwindshieldwhic