從結構、用途、制造等方面可以看出雙管板換熱器和(he)單(dan)管(guan)板(ban)換(huan)(huan)熱(re)(re)器是不(bu)一(yi)(yi)樣的(de)(de)。同單(dan)管(guan)板(ban)換(huan)(huan)熱(re)(re)器相比，雙管(guan)板(ban)換(huan)(huan)熱(re)(re)器管(guan)程(cheng)殼程(cheng)間泄漏概(gai)率(lv)要低(di)一(yi)(yi)些并且擁(yong)有良(liang)好的(de)(de)受力狀況。從結(jie)(jie)構(gou)看，雙管(guan)板(ban)換(huan)(huan)熱(re)(re)器采用固定管(guan)板(ban)式結(jie)(jie)構(gou)，管(guan)束不(bu)能抽出清洗。下面(mian)小編(bian)對雙管(guan)板(ban)換(huan)(huan)熱(re)(re)器與單(dan)管(guan)板(ban)換(huan)(huan)熱(re)(re)器的(de)(de)區別做一(yi)(yi)個對比。
1.雙(shuang)管(guan)板換熱器
北京(jing)燕山(shan)石(shi)化公司0.66 Mt/a乙烯改擴建工(gong)程中，制苯(ben)裝置(zhi)改造(zao)新(xin)上了三(san)臺雙管板換熱(re)器(qi)，即汽提(ti)塔再(zai)(zai)沸器(qi)(E-607，F=213 m2)、抽提(ti)蒸(zheng)餾塔再(zai)(zai)沸器(qi)(E-634，F=350 m2)和(he)余(yu)熱(re)溶(rong)(rong)劑(ji)冷(leng)卻器(qi)(E-111，F=150 m2)，它們的管程走Ⅳ.甲(jia)酰嗎啉溶(rong)(rong)劑(ji)，殼程走蒸(zheng)汽或(huo)水(shui)，該溶(rong)(rong)劑(ji)具有遇(yu)水(shui)發生分解的特(te)性。這三(san)臺換熱(re)器(qi)，經過(guo)一(yi)年多(duo)使用，效果很好(hao)，溶(rong)(rong)劑(ji)損(sun)耗同裝置(zhi)改造(zao)前相(xiang)比下降很多(duo)。
2.雙管板與單管板換(huan)熱器(qi)結構比較
雙(shuang)管(guan)(guan)板換(huan)熱器采用固定管(guan)(guan)板結構(gou)，管(guan)(guan)束(shu)不能抽出清(qing)洗(xi)，單管(guan)(guan)板換(huan)熱器可采用多(duo)種(zhong)結構(gou)型式(shi)，管(guan)(guan)束(shu)可以抽出清(qing)洗(xi)。對(dui)于溫差較大的雙(shuang)管(guan)(guan)板換(huan)熱器，簡體上可加裝波紋(wen)膨(peng)脹節(jie);而單管(guan)(guan)板換(huan)熱器除可考慮簡體上加裝波紋(wen)膨(peng)脹節(jie)外，常采用浮頭或(huo)U型管(guan)(guan)型式(shi)來補償。
對于(yu)雙(shuang)(shuang)管(guan)(guan)板(ban)換(huan)熱(re)器，存在二(er)種(zhong)(zhong)(zhong)設計理念(nian)的認(ren)(ren)識：一(yi)種(zhong)(zhong)(zhong)認(ren)(ren)為雙(shuang)(shuang)管(guan)(guan)板(ban)換(huan)熱(re)器用(yong)(yong)于(yu)絕對防止管(guan)(guan)殼程(cheng)(cheng)間(jian)(jian)介質(zhi)(zhi)混串的場(chang)合，設計在內外管(guan)(guan)板(ban)之(zhi)間(jian)(jian)空腔(qiang)上加(jia)(jia)裝排液倒淋閥(fa)，供日常觀察和(he)內管(guan)(guan)板(ban)發生泄(xie)漏時排放(fang)，使得(de)管(guan)(guan)殼程(cheng)(cheng)介質(zhi)(zhi)切實被內外二(er)層管(guan)(guan)板(ban)隔離(li)。這(zhe)是采(cai)用(yong)(yong)雙(shuang)(shuang)管(guan)(guan)板(ban)結構(gou)型式(shi)的主(zhu)要目的。另(ling)一(yi)種(zhong)(zhong)(zhong)認(ren)(ren)為雙(shuang)(shuang)管(guan)(guan)板(ban)換(huan)熱(re)器可用(yong)(yong)于(yu)管(guan)(guan)殼程(cheng)(cheng)間(jian)(jian)介質(zhi)(zhi)壓差很大的場(chang)合，設計在內外管(guan)(guan)板(ban)之(zhi)間(jian)(jian)的空腔(qiang)中加(jia)(jia)入一(yi)種(zhong)(zhong)(zhong)介質(zhi)(zhi)，來減小(xiao)管(guan)(guan)殼程(cheng)(cheng)間(jian)(jian)介質(zhi)(zhi)的壓差。這(zhe)和(he)一(yi)般(ban)單管(guan)(guan)板(ban)換(huan)熱(re)器一(yi)樣，不能絕對保證外管(guan)(guan)板(ban)上管(guan)(guan)口不發生泄(xie)漏。
3.雙(shuang)管(guan)板與單管(guan)板換(huan)器使用上的比較
單(dan)管(guan)(guan)板(ban)(ban)(ban)換熱(re)器最常(chang)(chang)見。在使用中除經常(chang)(chang)出(chu)現(xian)墊片螺栓(shuan)法蘭接(jie)頭(tou)密封泄(xie)漏(lou)外，還(huan)會出(chu)現(xian)管(guan)(guan)板(ban)(ban)(ban)上(shang)的管(guan)(guan)口泄(xie)漏(lou)，以及焊(han)(han)接(jie)裂紋等。單(dan)管(guan)(guan)板(ban)(ban)(ban)換熱(re)器管(guan)(guan)板(ban)(ban)(ban)上(shang)的管(guan)(guan)口泄(xie)漏(lou)大部分出(chu)現(xian)在焊(han)(han)接(jie)收(shou)弧處(chu)。焊(han)(han)接(jie)收(shou)弧時氣體未放干凈，有(you)砂(sha)眼。雙(shuang)管(guan)(guan)板(ban)(ban)(ban)換熱(re)器具(ju)有(you)內(nei)(nei)外雙(shuang)層(ceng)管(guan)(guan)板(ban)(ban)(ban)，如果內(nei)(nei)管(guan)(guan)板(ban)(ban)(ban)管(guan)(guan)口泄(xie)漏(lou)，還(huan)有(you)外管(guan)(guan)板(ban)(ban)(ban)防護。
單管板換熱器焊接(jie)裂(lie)紋(wen)常(chang)出現在換熱器簡(jian)體大法(fa)蘭盤錐體小端與簡(jian)體結合部。這(zhe)里出現問題(ti)的主(zhu)要(yao)原因，一是(shi)大法(fa)蘭盤錐體小端與簡(jian)體結合部應(ying)力大;二是(shi)幾何尺寸(cun)和(he)形狀突(tu)變，容(rong)易埋藏缺(que)陷。
雙管(guan)(guan)板(ban)換熱器(qi)壓(ya)力試驗要打(da)4遍壓(ya)(管(guan)(guan)程、兩內(nei)管(guan)(guan)板(ban)之間(jian)的(de)殼程、兩側(ce)內(nei)外管(guan)(guan)板(ban)之間(jian)的(de)腔(qiang)體(ti))，單管(guan)(guan)板(ban)換器(qi)壓(ya)力試驗要打(da)2～3遍壓(ya)(管(guan)(guan)程、殼程或管(guan)(guan)程、殼程、小浮頭)。
看(kan)了(le)上文相信大家(jia)對(dui)兩者的區別有了(le)一(yi)(yi)定的認識與了(le)解。雙管板換熱(re)器作為比單管板換器更可靠的換熱(re)器結構(gou)形(xing)式，可以更好地(di)推廣應(ying)用;但有一(yi)(yi)個首要(yao)前提就是雙管板換器制(zhi)造質量要(yao)好。
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