最近幾年，由(you)于(yu)社(she)會經濟(ji)不斷發展，各種各樣的(de)新(xin)事物開始出(chu)現(xian)在(zai)我們(men)的(de)身邊。說起換(huan)熱(re)器，我們(men)大家(jia)應該都不陌(mo)生。實(shi)際(ji)上，換(huan)熱(re)器是(shi)一種實(shi)現(xian)物料之間熱(re)量交換(huan)的(de)節能設備，它廣泛(fan)應用(yong)于(yu)國民(min)經濟(ji)的(de)各個領域。在(zai)生產中為了防止腐蝕和污染，以及滿足工藝(yi)流程、勞動(dong)保護、安全生產等方(fang)面的(de)要求，通常采用(yong)雙管板(ban)換(huan)熱(re)器來解決。下面就一起來看看雙管板(ban)換(huan)熱(re)器有哪些結構。
雙(shuang)管(guan)板換熱(re)器采用(yong)固定管(guan)板結構，管(guan)束不能抽出(chu)清洗，這是與(yu)單(dan)管(guan)板換熱(re)器可采用(yong)多種結構型式(shi)、管(guan)束可以抽出(chu)清洗不同的地方。對于(yu)溫差較大(da)的雙(shuang)管(guan)板換熱(re)器，筒體上可加裝波紋膨脹節;而單(dan)管(guan)板換熱(re)器除(chu)可考(kao)慮筒體上加裝波紋膨脹節外，常(chang)采用(yong)浮頭或(huo)U型管(guan)型式(shi)來補償。
對(dui)于雙(shuang)(shuang)管(guan)板(ban)換熱(re)器，存在兩種(zhong)設(she)(she)計(ji)(ji)理念的認(ren)識(shi)：一(yi)種(zhong)認(ren)為雙(shuang)(shuang)管(guan)板(ban)換熱(re)器用于絕對(dui)防止管(guan)殼(ke)程(cheng)間介質混串的場合，設(she)(she)計(ji)(ji)在內外(wai)管(guan)板(ban)之間空(kong)腔上加裝排液倒淋閥，供日(ri)常觀察和內管(guan)板(ban)發生泄漏時排放(fang)，使得管(guan)殼(ke)程(cheng)介質切實被內外(wai)二層管(guan)板(ban)隔離(li)。這是采用雙(shuang)(shuang)管(guan)板(ban)結(jie)構型式的主要目(mu)的。
另一種(zhong)認為雙管(guan)(guan)(guan)(guan)板(ban)(ban)(ban)換(huan)(huan)熱(re)器可用(yong)于管(guan)(guan)(guan)(guan)殼(ke)程(cheng)(cheng)(cheng)間(jian)介(jie)(jie)質(zhi)壓差很大的(de)場合，設計在內外管(guan)(guan)(guan)(guan)板(ban)(ban)(ban)之間(jian)的(de)空腔(qiang)中加(jia)入(ru)一種(zhong)介(jie)(jie)質(zhi)，來(lai)減小管(guan)(guan)(guan)(guan)殼(ke)程(cheng)(cheng)(cheng)間(jian)介(jie)(jie)質(zhi)的(de)壓差。這和一般單管(guan)(guan)(guan)(guan)板(ban)(ban)(ban)換(huan)(huan)熱(re)器一樣(yang)，不能(neng)(neng)絕對(dui)保證外管(guan)(guan)(guan)(guan)板(ban)(ban)(ban)上管(guan)(guan)(guan)(guan)口不發生泄(xie)漏。雙管(guan)(guan)(guan)(guan)板(ban)(ban)(ban)之間(jian)的(de)隔(ge)離腔(qiang)是與單管(guan)(guan)(guan)(guan)板(ban)(ban)(ban)換(huan)(huan)熱(re)器結構主要區(qu)別(bie)之處(chu)(見圖1)，該隔(ge)離腔(qiang)不與管(guan)(guan)(guan)(guan)程(cheng)(cheng)(cheng)、殼(ke)程(cheng)(cheng)(cheng)相連通，不承受(shou)介(jie)(jie)質(zhi)壓力，但承受(shou)設備的(de)機械(xie)載荷(he)與熱(re)載荷(he)。隔(ge)離腔(qiang)的(de)承載能(neng)(neng)力主要取決于雙管(guan)(guan)(guan)(guan)板(ban)(ban)(ban)間(jian)距。對(dui)固(gu)定(ding)式雙管(guan)(guan)(guan)(guan)板(ban)(ban)(ban)進行(xing)殼(ke)程(cheng)(cheng)(cheng)水壓試驗時，內側管(guan)(guan)(guan)(guan)板(ban)(ban)(ban)與換(huan)(huan)熱(re)管(guan)(guan)(guan)(guan)連接處(chu)可能(neng)(neng)存(cun)在泄(xie)漏，故在確(que)定(ding)雙管(guan)(guan)(guan)(guan)板(ban)(ban)(ban)間(jian)距時必(bi)須考慮觀察、檢漏所需(xu)要的(de)最(zui)小空間(jian)。
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