從結構、用途、制造等方面可以看出雙管板換熱器和單(dan)管(guan)(guan)板(ban)換熱(re)器(qi)是(shi)不一(yi)樣的。同單(dan)管(guan)(guan)板(ban)換熱(re)器(qi)相比，雙(shuang)(shuang)管(guan)(guan)板(ban)換熱(re)器(qi)管(guan)(guan)程殼(ke)程間泄漏概率(lv)要低一(yi)些并且擁有良好的受力狀(zhuang)況(kuang)。從結(jie)構(gou)看，雙(shuang)(shuang)管(guan)(guan)板(ban)換熱(re)器(qi)采用固定管(guan)(guan)板(ban)式結(jie)構(gou)，管(guan)(guan)束不能抽(chou)出清洗(xi)。下面小編對雙(shuang)(shuang)管(guan)(guan)板(ban)換熱(re)器(qi)與單(dan)管(guan)(guan)板(ban)換熱(re)器(qi)的區別做(zuo)一(yi)個對比。
1.雙管板換熱器(qi)
北京(jing)燕山石(shi)化公(gong)司0.66 Mt/a乙烯(xi)改(gai)擴建工程(cheng)中，制苯裝(zhuang)置改(gai)造(zao)新上(shang)了(le)三(san)臺雙(shuang)管(guan)板換熱器(qi)(qi)(qi)，即(ji)汽提塔再(zai)沸器(qi)(qi)(qi)(E-607，F=213 m2)、抽提蒸餾塔再(zai)沸器(qi)(qi)(qi)(E-634，F=350 m2)和(he)余(yu)熱溶(rong)劑(ji)(ji)冷卻器(qi)(qi)(qi)(E-111，F=150 m2)，它(ta)們的管(guan)程(cheng)走(zou)Ⅳ.甲酰嗎啉溶(rong)劑(ji)(ji)，殼(ke)程(cheng)走(zou)蒸汽或水，該溶(rong)劑(ji)(ji)具(ju)有遇水發生分解的特性。這三(san)臺換熱器(qi)(qi)(qi)，經過一(yi)年多使用，效果很(hen)好，溶(rong)劑(ji)(ji)損(sun)耗同(tong)裝(zhuang)置改(gai)造(zao)前相比下(xia)降很(hen)多。
2.雙管板與(yu)單管板換熱(re)器結構比較
雙管(guan)(guan)板(ban)換(huan)熱(re)(re)器采用(yong)固定管(guan)(guan)板(ban)結構，管(guan)(guan)束不能(neng)抽出清洗(xi)(xi)，單管(guan)(guan)板(ban)換(huan)熱(re)(re)器可采用(yong)多(duo)種結構型式，管(guan)(guan)束可以抽出清洗(xi)(xi)。對于溫差(cha)較大的雙管(guan)(guan)板(ban)換(huan)熱(re)(re)器，簡體上可加裝波紋膨脹節;而單管(guan)(guan)板(ban)換(huan)熱(re)(re)器除(chu)可考慮(lv)簡體上加裝波紋膨脹節外，常采用(yong)浮頭或(huo)U型管(guan)(guan)型式來補償。
對(dui)于雙(shuang)管(guan)(guan)(guan)板(ban)(ban)(ban)(ban)換(huan)熱器，存在二(er)種設(she)(she)計理念(nian)的(de)認識(shi)：一(yi)種認為(wei)雙(shuang)管(guan)(guan)(guan)板(ban)(ban)(ban)(ban)換(huan)熱器用于絕(jue)對(dui)防止管(guan)(guan)(guan)殼(ke)程(cheng)間(jian)介質(zhi)混串的(de)場合(he)，設(she)(she)計在內外(wai)管(guan)(guan)(guan)板(ban)(ban)(ban)(ban)之(zhi)間(jian)空腔上加裝排(pai)液(ye)倒淋(lin)閥，供日常(chang)觀察和(he)內管(guan)(guan)(guan)板(ban)(ban)(ban)(ban)發生泄漏時排(pai)放，使得管(guan)(guan)(guan)殼(ke)程(cheng)介質(zhi)切實被內外(wai)二(er)層管(guan)(guan)(guan)板(ban)(ban)(ban)(ban)隔(ge)離。這是采用雙(shuang)管(guan)(guan)(guan)板(ban)(ban)(ban)(ban)結構型式(shi)的(de)主(zhu)要目的(de)。另一(yi)種認為(wei)雙(shuang)管(guan)(guan)(guan)板(ban)(ban)(ban)(ban)換(huan)熱器可用于管(guan)(guan)(guan)殼(ke)程(cheng)間(jian)介質(zhi)壓(ya)差(cha)很大的(de)場合(he)，設(she)(she)計在內外(wai)管(guan)(guan)(guan)板(ban)(ban)(ban)(ban)之(zhi)間(jian)的(de)空腔中加入一(yi)種介質(zhi)，來減(jian)小(xiao)管(guan)(guan)(guan)殼(ke)程(cheng)間(jian)介質(zhi)的(de)壓(ya)差(cha)。這和(he)一(yi)般單(dan)管(guan)(guan)(guan)板(ban)(ban)(ban)(ban)換(huan)熱器一(yi)樣(yang)，不(bu)能絕(jue)對(dui)保證外(wai)管(guan)(guan)(guan)板(ban)(ban)(ban)(ban)上管(guan)(guan)(guan)口不(bu)發生泄漏。
3.雙(shuang)管板與單管板換(huan)器使用上的比較
單管(guan)(guan)板(ban)換熱(re)器最(zui)常(chang)見(jian)。在(zai)使用中除經常(chang)出現(xian)墊片螺栓法(fa)蘭接(jie)頭密封泄漏(lou)外(wai)，還(huan)會(hui)出現(xian)管(guan)(guan)板(ban)上(shang)的(de)管(guan)(guan)口泄漏(lou)，以及焊(han)接(jie)裂紋等。單管(guan)(guan)板(ban)換熱(re)器管(guan)(guan)板(ban)上(shang)的(de)管(guan)(guan)口泄漏(lou)大部分出現(xian)在(zai)焊(han)接(jie)收弧處。焊(han)接(jie)收弧時氣(qi)體(ti)未(wei)放干(gan)凈，有(you)(you)砂眼(yan)。雙管(guan)(guan)板(ban)換熱(re)器具(ju)有(you)(you)內外(wai)雙層管(guan)(guan)板(ban)，如果內管(guan)(guan)板(ban)管(guan)(guan)口泄漏(lou)，還(huan)有(you)(you)外(wai)管(guan)(guan)板(ban)防護。
單管板換熱器焊接裂紋(wen)常(chang)出現在換熱器簡體大法蘭盤(pan)錐(zhui)體小端(duan)與簡體結合部。這里出現問題的主要原因，一是大法蘭盤(pan)錐(zhui)體小端(duan)與簡體結合部應(ying)力(li)大;二是幾何尺寸(cun)和(he)形狀突(tu)變，容易埋藏(zang)缺陷。
雙管(guan)板換(huan)熱器壓(ya)(ya)(ya)力試驗(yan)要打(da)(da)4遍(bian)壓(ya)(ya)(ya)(管(guan)程(cheng)(cheng)、兩內管(guan)板之間的殼(ke)程(cheng)(cheng)、兩側內外管(guan)板之間的腔體(ti))，單管(guan)板換(huan)器壓(ya)(ya)(ya)力試驗(yan)要打(da)(da)2～3遍(bian)壓(ya)(ya)(ya)(管(guan)程(cheng)(cheng)、殼(ke)程(cheng)(cheng)或管(guan)程(cheng)(cheng)、殼(ke)程(cheng)(cheng)、小浮頭)。
看了(le)上(shang)文相信大家對兩者的(de)區別有了(le)一定的(de)認識與(yu)了(le)解。雙管(guan)(guan)板(ban)換(huan)熱器作(zuo)為比(bi)單管(guan)(guan)板(ban)換(huan)器更(geng)(geng)可(ke)靠的(de)換(huan)熱器結(jie)構形式，可(ke)以更(geng)(geng)好地推廣應用;但有一個首(shou)要前提就是雙管(guan)(guan)板(ban)換(huan)器制(zhi)造質量要好。
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