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这些换热器强化传热技术你都选对了吗?

发布:vzajc 浏览:1041次

强化传热

换热器被广泛应用于冶金、化工等工业领域中。换热器强化传热技术的应用能够节能环保,降低运营成本。


今天,就带大家扒一扒换热器的强化传热技术。


一、换热器的分类及工作原理


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体球网XIANLAISANZHANGDONGTUGONGQIYOUMENWENGUYIXIAHUANREQIDEGONGZUOYUANLI。





二、强化传热的手段概述


HUANREQICHUANREQIANGHUATONGCHANGSHIYONGDESHOUDUANBAOKUOSANLEI:KUOZHANCHUANREJI(F);JIADACHUANREWENCHA;TIGAOCHUANREXISHU(K)。


1扩展传热面积F 


KUOZHANCHUANREMIANJISHIZENGJIACHUANREXIAOGUOSHIYONGZUIDUO、ZUIJIANDANDEYIZHONGFANGFA。


现在使用最多的是通过合理地提高设备单位体积的传热面积体球网来达到增强传热效果的目的。


体球网RUZAIHUANREQISHANGDALIANGSHIYONGDANWEITIJICHUANREMIANJIBIJIAODADECHIPIANGUAN、BOWENGUAN、BANCHICHUANREMIANDENGCAILIAO,TONGGUOZHEIXIECAILIAODESHIYONG,DANTAISHEBEIDEDANWEITIJIDECHUANREMIANJIHUIMINGXIANTIGAO,CHONGFENDADAOHUANRESHEBEIGAOXIAO、JINCOUDEMUDE。 


2加大传热温差Δt 


JIADAHUANREQICHUANREWENCHAΔtSHIJIAQIANGHUANREQIHUANREXIAOGUOCHANGYONGDECUOSHIZHIYI。


ZAIHUANREQISHIYONGGUOCHENGZHONG,TIGAOFUSHECAINUANBANGUANNEIZHENGQIDEYALI,TIGAORESHUICAINUANDERESHUIWENDU,LENGNINGQILENGQUESHUIYONGWENDUJIAODIDESHENJINGSHUIDAITIZILAISHUI,KONGQILENGQUEQIZHONGJIANGDILENGQUESHUIDEWENDUDENG,DOUKEYIZHIJIEZENGJIAHUANREQICHUANREWENCHAΔt。


DANSHI,ZENGJIAHUANREQICHUANREWENCHAΔtSHIYOUYIDINGXIANDUDE,WOMENBUNENGBATAZUOWEIZENGQIANGHUANREQICHUANREXIAOGUOZUIZHUYAODESHOUDUAN。


依靠增加换热器传热温差Δt只能有限度的提高换热器换热效果;同时,传热温差的增大将使整个热力系统的不可逆性增加,降低了热力系统的可用性。


3增强传热系数(K) 


增强换热器传热效果最积极的措施就是设法提高设备的传热系数(K)。 


HUANREQICHUANREXISHU(K)DEDAXIAOSHIJISHANGSHIYOUCHUANREGUOCHENGZONGREZUDEDAXIAOLAIJUEDING,HUANREQICHUANREGUOCHENGZHONGDEZONGREZUYUEDA,HUANREQICHUANREXISHU(K)ZHIYEJIUYUEDI;HUANREQICHUANREXISHU(K)ZHIYUEDI,HUANREQICHUANREXIAOGUOYEJIUYUECHA。


HUANREQIZAISHIYONGGUOCHENGZHONG,QIZONGREZUSHIGEXIANGFENREZUDEDIEJIA,SUOYIYAOGAIBIANCHUANREXISHUJIUBIXUFENXICHUANREGUOCHENGDEMEIYIXIANGFENREZU。



体球网CONGSHANGSHIZHONGKEZHI: YAOTIGAOCHUANREXISHU, BIXUSHEFATIGAOα1 HEα2JIλ,JIANGDIδHENEIWAIWUGOUREZUR1 HER2。


三、强化传热技术


QIANGHUACHUANREJISHUFENWEIBEIDONGSHIQIANGHUAJISHUHEZHUDONGSHIQIANGHUAJISHU。


QIANZHESHIZHICHULEJIEZHISHUSONGGONGLVWAIBUXUYAOXIAOHAOEWAIDONGLIDEJISHU;HOUZHESHIZHIXUYAOJIARUEWAIDONGLIYIDADAOQIANGHUACHUANREMUDEDEJISHU。 


1被动式强化传热技术 


处理表面  


体球网BAOKUODUIBIAOMIANCUCAODUDEXIAOCHIDUGAIBIANHEDUIBIAOMIANJINXINGLIANXUHUOBULIANXUDETUCENG。


KETONGGUOSHAOJIE、JIXIEJIAGONGHEDIANHUAXUEFUSHIDENGFANGFAJIANGCHUANREBIAOMIANCHULICHENGDUOKONGBIAOMIANHUOJUCHIXINGBIAOMIAN,RUKAICAO、MOYA、NIANYA、YAZHI、GUNHUA、SHUSHUITUCENGHEDUOKONGTUCENGDENG。



此种处理表面的粗糙度达不到影响单相流体传热的高度, 通常用于强化沸腾传热和冷凝传热。


粗糙表面  


TONGCHANG,KETONGGUOJIXIEJIAGONG、NIANYAHEDIANHUAXUEFUSHIDENGFANGFAZHIZUOCUCAOBIAOMIAN。


粗糙表面主要是通过促进近壁区流体的湍流强度、阻隔边界层连续发展减小层流底层的厚度来降低热阻, 而不是靠增大传热面积来达到强化传热的目的, 主要用于强化单相流体的传热, 对沸腾和冷凝过程有一定的强化作用。


体球网JIYUCUCAOBIAOMIANJISHUKAIFACHUDEDUOZHONGYIXINGQIANGHUACHUANREGUANZAIGONGYESHENGCHANZHONGDEYINGYONGPOWEIGUANGFAN, BAOKUOYOU: LUOXUANCAOGUAN、XUANLIUGUAN、SUOFANGGUAN、BOWENGUAN、ZHENCHIGUAN、HENGWENCAOGUAN、QIANGHUALENGNINGCHUANREDEJUCHIXINGCHIPIANGUANHEHUABANXINGCHIPIANGUAN、QIANGHUAFEITENGCHUANREDEGAOXIAOFEITENGCHUANREGUANYIJILUOXUANNIUQUGUAN。



扩展表面  


QIQIANGHUACHUANREDEJILIZHUYAOSHICILEIKUOZHANBIAOMIANZHONGSULEYUANSHIDECHUANREBIAOMIAN, BUJINZENGJIALECHUANREMIANJI,ERQIEDADUANLEQIBIANJIECENGDELIANXUFAZHAN, TIGAOLERAODONGCHENGDU,ZENGJIALECHUANREXISHU, CONGERNENGGOUQIANGHUACHUANRE,DUICENGLIUHUANREHETUANLIUHUANREDOUYOUXIANZHUDEXIAOGUO。


不仅用于传统的管壳式换热器管子结构的改进,而且也越来越多的应用于紧凑式换热器


MUQIANYIKAIFACHULEGEZHONGBUTONGXINGSHIDEKUOZHANBIAOMIAN, RUGUANWAICHIPIANHEGUANNEICHIPIAN、CHALIEDUANLEI、BOXINGCHIDUOKONGXING、XIAODINGXING、DICHIPIANGUAN、TAIYANGBANGGUAN、BAIYECHUANGCHIJIKAIKONGBAIYECHUANGCHI(DUOZAIJINCOUSHIHUANREQIZHONGSHIYONG)DENG。 



扰流装置  


把扰流装置放置在流道内能改变近壁区的流体流动,从而间接增强传热表面处的能量传输,主要用于强制对流


GUANNEICHARUWUZHONGYOUHENDUODOUSHUYUZHEIZHONGRAOLIUZHUANGZHI, RUJINSHUZHAWANG、JINGTAIHUNHEQIJIGESHIDEHUAN、PANHUOQIUDENGYUANJIAN。



漩涡流装置  


体球网BAOKUOHENDUOBUTONGDEJIHEBUZHIHUOGUANNEICHARUWU, RUNEIZHIXUANWOFASHENGQI、NIUDAICHARUWUHEDAIYOULUOXUANXINGXIANQUANDEZHOUXIANGXINTICHARUWU。


CILEIZHUANGZHINENGZENGJIALIUDAOZHANGDUBINGNENGCHANSHENGXUANZHUANLIUDONGHUO(HE)ERCILIU,CONGERNENGZENGQIANGLIUTIDEJINGXIANGHUNHE,CUJINLIUTISUDUFENBUHEWENDUFENBUDEJUNYUNXING, JINERNENGGOUQIANGHUACHUANRE。


主要用于增强强制对流传热, 对层流换热的强化效果尤其显著。 


螺旋盘管  


其应用可提高换热器的紧凑度,它所产生的二次流能提高单相流体传热的传热系数, 也能增强沸腾传热


表面张力装置


包括利用相对较厚的芯吸材料或开槽表面来引导流体的流动, 主要用于沸腾和冷凝传热。


体球网XINXIZUOYONGCHANGYONGZAIMEIYOUXINXICAILIAOLENGQUEJIEZHIJIUBUNENGDAODASHOUREBIAOMIANDEQINGXING,CHANGJIANDERUREGUANHUANREQI;HAIDUISHUIZHONGBIAOMIANDEFEITENGHUANREQIANGHUAFEICHANGYOUXIAO。 


添加物  


体球网BAOKUOYONGYUYETITIXIDETIANJIAJIHEYONGYUQITITIXIDETIANJIAJI。


液体中的添加剂包括用于单相流的固体粒子与气泡和用于沸腾系统的微量液体;气体中的添加剂包括液滴和固体粒子, 可用于稀相(气固悬浮液)或密相(流化床)。 


壳程强化  


YISHIGAIBIANGUANZIWAIXINGHUOZAIGUANWAIJIACHIPIAN,JITONGGUOGUANZIXINGZHUANGHUOBIAOMIANXINGZHIDEGAIZAOLAIQIANGHUACHUANRE。


ERSHIGAIBIANQIAOCHENGDANGBANHUOGUANJIANZHICHENGWUDEXINGSHI,JINKENENGXIAOCHUQIAOCHENGLIUDONGYUCHUANREDEZHILIUSIQU, JINKENENGJIANSHAOSHENZHIXIAOCHUHENGLIUCHENGFEN, ZENGQIANGHUOWANQUANBIANWEIZONGXIANGLIU。


体球网JINNIANYANJIUCHUDEXUDUOXINDEQIAOCHENGZHICHENGJIEGOU,YOUXIAOMIBULEDANGONGXINGZHELIUBANZHICHENGWUDEBUZU。