從結構、用途、制造等方面可以看出雙管板換熱器和(he)單管(guan)(guan)板(ban)(ban)換(huan)熱器是不一(yi)樣(yang)的。同單管(guan)(guan)板(ban)(ban)換(huan)熱器相比，雙(shuang)管(guan)(guan)板(ban)(ban)換(huan)熱器管(guan)(guan)程(cheng)(cheng)殼程(cheng)(cheng)間泄漏概率要低一(yi)些并且擁有良好的受力狀(zhuang)況(kuang)。從結構(gou)(gou)看(kan)，雙(shuang)管(guan)(guan)板(ban)(ban)換(huan)熱器采用固定管(guan)(guan)板(ban)(ban)式結構(gou)(gou)，管(guan)(guan)束不能(neng)抽出清洗。下面小編對雙(shuang)管(guan)(guan)板(ban)(ban)換(huan)熱器與(yu)單管(guan)(guan)板(ban)(ban)換(huan)熱器的區別(bie)做一(yi)個(ge)對比。
1.雙(shuang)管板換(huan)熱器
北京燕山石(shi)化公司0.66 Mt/a乙烯改(gai)擴建工程(cheng)中(zhong)，制(zhi)苯裝置改(gai)造(zao)新上了(le)三臺雙管板(ban)換(huan)熱(re)(re)器(qi)，即(ji)汽(qi)提(ti)塔再沸器(qi)(E-607，F=213 m2)、抽(chou)提(ti)蒸餾塔再沸器(qi)(E-634，F=350 m2)和余熱(re)(re)溶(rong)(rong)劑(ji)冷卻器(qi)(E-111，F=150 m2)，它們的管程(cheng)走Ⅳ.甲(jia)酰嗎啉溶(rong)(rong)劑(ji)，殼程(cheng)走蒸汽(qi)或水(shui)，該溶(rong)(rong)劑(ji)具有遇水(shui)發生分解的特(te)性(xing)。這三臺換(huan)熱(re)(re)器(qi)，經過一(yi)年(nian)多使用(yong)，效果(guo)很好(hao)，溶(rong)(rong)劑(ji)損耗同裝置改(gai)造(zao)前相(xiang)比下(xia)降很多。
2.雙管(guan)板(ban)與單管(guan)板(ban)換熱器(qi)結構比較
雙管(guan)板(ban)(ban)換(huan)熱器(qi)采(cai)用(yong)固(gu)定管(guan)板(ban)(ban)結構(gou)，管(guan)束不能(neng)抽出清(qing)洗，單(dan)(dan)管(guan)板(ban)(ban)換(huan)熱器(qi)可(ke)采(cai)用(yong)多種結構(gou)型(xing)(xing)(xing)式(shi)，管(guan)束可(ke)以抽出清(qing)洗。對于溫差較大的雙管(guan)板(ban)(ban)換(huan)熱器(qi)，簡體上可(ke)加裝波紋膨(peng)(peng)脹節;而單(dan)(dan)管(guan)板(ban)(ban)換(huan)熱器(qi)除可(ke)考(kao)慮簡體上加裝波紋膨(peng)(peng)脹節外，常采(cai)用(yong)浮頭或U型(xing)(xing)(xing)管(guan)型(xing)(xing)(xing)式(shi)來補償。
對于(yu)雙管(guan)(guan)(guan)(guan)(guan)板(ban)(ban)(ban)換(huan)(huan)熱(re)器(qi)，存在(zai)(zai)(zai)二種(zhong)設(she)計(ji)(ji)理念的(de)(de)(de)認識：一(yi)種(zhong)認為雙管(guan)(guan)(guan)(guan)(guan)板(ban)(ban)(ban)換(huan)(huan)熱(re)器(qi)用(yong)于(yu)絕對防止(zhi)管(guan)(guan)(guan)(guan)(guan)殼(ke)程(cheng)(cheng)間(jian)(jian)介(jie)質混串的(de)(de)(de)場合(he)，設(she)計(ji)(ji)在(zai)(zai)(zai)內(nei)外(wai)管(guan)(guan)(guan)(guan)(guan)板(ban)(ban)(ban)之間(jian)(jian)空腔(qiang)上加(jia)(jia)裝(zhuang)排液倒(dao)淋閥，供日常觀察(cha)和內(nei)管(guan)(guan)(guan)(guan)(guan)板(ban)(ban)(ban)發生泄漏(lou)時排放，使得管(guan)(guan)(guan)(guan)(guan)殼(ke)程(cheng)(cheng)介(jie)質切實被(bei)內(nei)外(wai)二層管(guan)(guan)(guan)(guan)(guan)板(ban)(ban)(ban)隔離。這是(shi)采用(yong)雙管(guan)(guan)(guan)(guan)(guan)板(ban)(ban)(ban)結(jie)構型式的(de)(de)(de)主要目的(de)(de)(de)。另一(yi)種(zhong)認為雙管(guan)(guan)(guan)(guan)(guan)板(ban)(ban)(ban)換(huan)(huan)熱(re)器(qi)可(ke)用(yong)于(yu)管(guan)(guan)(guan)(guan)(guan)殼(ke)程(cheng)(cheng)間(jian)(jian)介(jie)質壓差(cha)很大的(de)(de)(de)場合(he)，設(she)計(ji)(ji)在(zai)(zai)(zai)內(nei)外(wai)管(guan)(guan)(guan)(guan)(guan)板(ban)(ban)(ban)之間(jian)(jian)的(de)(de)(de)空腔(qiang)中(zhong)加(jia)(jia)入(ru)一(yi)種(zhong)介(jie)質，來減小(xiao)管(guan)(guan)(guan)(guan)(guan)殼(ke)程(cheng)(cheng)間(jian)(jian)介(jie)質的(de)(de)(de)壓差(cha)。這和一(yi)般單管(guan)(guan)(guan)(guan)(guan)板(ban)(ban)(ban)換(huan)(huan)熱(re)器(qi)一(yi)樣(yang)，不能(neng)絕對保證外(wai)管(guan)(guan)(guan)(guan)(guan)板(ban)(ban)(ban)上管(guan)(guan)(guan)(guan)(guan)口不發生泄漏(lou)。
3.雙(shuang)管(guan)板與單管(guan)板換器使用上的(de)比較
單管(guan)(guan)(guan)板(ban)(ban)(ban)換熱(re)器(qi)最常見。在使用中(zhong)除經常出現墊片(pian)螺(luo)栓法蘭接(jie)(jie)頭密封(feng)泄漏(lou)外，還(huan)會(hui)出現管(guan)(guan)(guan)板(ban)(ban)(ban)上的管(guan)(guan)(guan)口泄漏(lou)，以及焊接(jie)(jie)裂紋(wen)等。單管(guan)(guan)(guan)板(ban)(ban)(ban)換熱(re)器(qi)管(guan)(guan)(guan)板(ban)(ban)(ban)上的管(guan)(guan)(guan)口泄漏(lou)大部(bu)分出現在焊接(jie)(jie)收(shou)弧處。焊接(jie)(jie)收(shou)弧時氣(qi)體未放干凈，有(you)砂眼。雙管(guan)(guan)(guan)板(ban)(ban)(ban)換熱(re)器(qi)具有(you)內外雙層管(guan)(guan)(guan)板(ban)(ban)(ban)，如果(guo)內管(guan)(guan)(guan)板(ban)(ban)(ban)管(guan)(guan)(guan)口泄漏(lou)，還(huan)有(you)外管(guan)(guan)(guan)板(ban)(ban)(ban)防(fang)護(hu)。
單管板(ban)換熱器焊(han)接裂紋常(chang)出現在換熱器簡(jian)體大法(fa)(fa)蘭(lan)(lan)盤(pan)錐體小(xiao)端(duan)與(yu)簡(jian)體結合部。這(zhe)里出現問(wen)題(ti)的(de)主要(yao)原因，一是(shi)(shi)大法(fa)(fa)蘭(lan)(lan)盤(pan)錐體小(xiao)端(duan)與(yu)簡(jian)體結合部應力大;二是(shi)(shi)幾何(he)尺寸和形(xing)狀(zhuang)突變，容易埋藏缺陷。
雙管板(ban)換熱器壓力(li)試驗要(yao)打4遍壓(管程(cheng)、兩內(nei)管板(ban)之間(jian)的(de)殼程(cheng)、兩側(ce)內(nei)外管板(ban)之間(jian)的(de)腔體)，單管板(ban)換器壓力(li)試驗要(yao)打2～3遍壓(管程(cheng)、殼程(cheng)或管程(cheng)、殼程(cheng)、小浮頭)。
看了上(shang)文相信大家(jia)對兩者的(de)區別(bie)有(you)了一定的(de)認識與了解。雙管板換(huan)熱器(qi)(qi)(qi)作為比單管板換(huan)器(qi)(qi)(qi)更(geng)(geng)可靠的(de)換(huan)熱器(qi)(qi)(qi)結構形式(shi)，可以更(geng)(geng)好(hao)地(di)推廣應用;但有(you)一個(ge)首要(yao)前提就是雙管板換(huan)器(qi)(qi)(qi)制造質(zhi)量要(yao)好(hao)。
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