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U型管式換熱器

管殼式(shi)換(huan)熱(re)器(qi)(qi)的一(yi)(yi)種，屬石(shi)油化工設(she)備，由管箱、殼體及(ji)管束等主(zhu)要部件組成，因(yin)其換(huan)熱(re)管成U形而得名。U 形管式(shi)換(huan)熱(re)器(qi)(qi)僅(jin)有一(yi)(yi)個管板，管子兩端(duan)均固定于同一(yi)(yi)管板上(shang)。

此類(lei)換熱器的(de)特(te)點是管(guan)(guan)(guan)(guan)(guan)(guan)(guan)束(shu)可以自由伸(shen)縮，不(bu)會因管(guan)(guan)(guan)(guan)(guan)(guan)(guan)殼(ke)之間(jian)的(de)溫(wen)差而產生熱應力(li)，熱補償性(xing)能(neng)好(hao)；管(guan)(guan)(guan)(guan)(guan)(guan)(guan)程為雙管(guan)(guan)(guan)(guan)(guan)(guan)(guan)程，流(liu)程較(jiao)長，流(liu)速較(jiao)高(gao)，傳熱性(xing)能(neng)較(jiao)好(hao)；承壓能(neng)力(li)強；管(guan)(guan)(guan)(guan)(guan)(guan)(guan)束(shu)可從殼(ke)體內抽(chou)出，便(bian)于(yu)(yu)檢修和清洗，且結構簡單，造價便(bian)宜。但管(guan)(guan)(guan)(guan)(guan)(guan)(guan)內清洗不(bu)便(bian)，管(guan)(guan)(guan)(guan)(guan)(guan)(guan)束(shu)中(zhong)間(jian)部分的(de)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)子(zi)難以更換，又因最(zui)內層管(guan)(guan)(guan)(guan)(guan)(guan)(guan)子(zi)彎(wan)曲半徑不(bu)能(neng)太小，在(zai)(zai)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)板中(zhong)心(xin)部分布管(guan)(guan)(guan)(guan)(guan)(guan)(guan)不(bu)緊湊，所以管(guan)(guan)(guan)(guan)(guan)(guan)(guan)子(zi)數不(bu)能(neng)太多，且管(guan)(guan)(guan)(guan)(guan)(guan)(guan)束(shu)中(zhong)心(xin)部分存在(zai)(zai)間(jian)隙，使殼(ke)程流(liu)體易于(yu)(yu)短路而影響殼(ke)程換熱。此外，為了彌補彎(wan)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)后管(guan)(guan)(guan)(guan)(guan)(guan)(guan)壁(bi)(bi)的(de)減(jian)薄，直管(guan)(guan)(guan)(guan)(guan)(guan)(guan)部分需用(yong)壁(bi)(bi)較(jiao)厚的(de)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)子(zi)。這就影響了它(ta)的(de)使用(yong)場合(he)，僅宜用(yong)于(yu)(yu)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)殼(ke)壁(bi)(bi)溫(wen)相差較(jiao)大，或殼(ke)程介質易結

垢(gou)而管程介質清(qing)潔(jie)及不(bu)易結(jie)垢(gou)，高溫、高壓(ya)、腐蝕性強的(de)情形。